Name: Milwaukee 48-89-2329 1/2-Inch Thunderbolt Cobalt Drill Bit
Brand: Milwaukee
SKU: 2PLNPY9WKZ8M
Price: 69.36 CAD
Availability: OutOfStock
Rating: 2.9 (9 reviews)

Walmart US Ecommerce Website

GENERAL MERCHANDISE

PHARMACY

GROCERIES

VUDU

SPARK

PHOTO

ADVERTISING

SAVINGS CATCHER

GIFTCARDS

INHOME

AFFILIATE

ONEAPP

LOTUS

HELP

SMART_REORDER

GROCERY

CONV_COMMERCE

Buy Box Ad Container Module for Desktop

Custom HTML Module - About Klarna

Custom HTML Module - About SalesFinancing - Second update

You'll choose a plan at checkout.

#515357

I want delivery savings with Delivery Pass

#0071dc

NEW Fulfillment Tue Apr 15 2025 2:17 PM EDT

MTZ Team | Marquee 1 Ad | Item Page

MTZ Team | Marquee 2  Ad | Item Page

MTZ Team | Skyline Ad | Item Page

Other products of interest

MTZ Team | Sponsored Product Carousel - Item Page

More items to explore

MTZ Team | Sponsored Product Carousel - Item Page Broad 

NEW AddonServicesRedesign Fri Jul 18 2025 1:30 PM EDT

NEW AddToCart Mon Jul 14 2025 3:50 PM EDT

NEW AddToCart Tue Apr 15 2025 2:19 PM EDT

NEW BrandBoxDisplayAd Mon Jul 14 2025 9:14 PM EDT

NEW BrandLink Wed Apr 23 2025 12:07 AM EDT

NEW Breadcrumb Mon Apr 07 2025 8:23 PM EDT

Walmart Rewards Mastercard

NEW FinancingOptions Tue Dec 10 2024 3:32 PM EST

I want shipping & delivery savings with

NEW Fulfillment Mon Jul 14 2025 4:00 PM EDT

NEW InternationalShipping Mon May 18 2026 1:02 PM EDT

New Item Page - Nutrition Value Placeholder Module, Wednesday, February 08, 2023, 5:11:53:90 pm

New Item Page - Product Description Placeholder Module, Wednesday, February 08, 2023, 5:14:04:38 pm

New Item Page - Product Ingredients Placeholder Module, Friday, February 10, 2023, 10:34:23:79 am

New Item Page - Product Specifications Placeholder Module, Wednesday, February 08, 2023, 5:15:29:61 pm

New Item Page - Reviews Placeholder Module, Wednesday, March 22, 2023, 10:04:29:34 am

New Item Related Shelves Module, Thursday, June 15, 2023, 6:08:51:10 am

 Price Match Policy

Prices, terms, and availability may vary online, in stores, and in–app. If the advertised price is not shown here, inventory at the advertised price may now be sold out. Please see the other offers, if available, while quantities last. Some items may be available from Marketplace Sellers, who set their own prices, and are not eligible for price match. Items sold in store by Walmart may be eligible for a price match to online items shipped and sold by Walmart. For variable weight items, price shown is an estimated price only – you will be charged for the actual weight of the item. See our

NEW LegalPriceDisclaimer Mon Jul 14 2025 4:11 PM EDT

NEW LegalPriceDisclaimer Wed Apr 30 2025 12:13 AM EDT

NEW ListsAndRegistries Tue Apr 15 2025 4:50 PM EDT

NEW PaymentPlans Mon Jul 14 2025 4:15 PM EDT

NEW PaymentPlans Tue Apr 15 2025 1:31 PM EDT

NEW PriceInformation Tue Apr 15 2025 1:30 PM EDT

NEW ProductDescriptionPlaceholderATF Tue Jul 08 2025 11:41 PM EDT

NEW ProductFlags Thu Apr 10 2025 11:42 PM EDT

NEW ProductHighlightsPlaceholder Wed Jul 02 2025 12:43 AM EDT

NEW ProductImages Tue Apr 15 2025 2:13 PM EDT

NEW ProductName Tue Apr 15 2025 12:53 PM EDT

NEW ProductReturnPolicyDetails Tue Dec 10 2024 3:17 PM EST

NEW ProductReturnPolicy Mon Jul 14 2025 5:04 PM EDT

Return Policy

NEW ProductReturnPolicy Tue Apr 15 2025 2:28 PM EDT

NEW ProductStickyBuyBox Wed Jul 02 2025 12:55 AM EDT

NEW PromoDiscount Tue Apr 15 2025 6:53 PM EDT

New SellersSecondaryBuyBox Module, Tuesday, September 05, 2023, 4:02:21:76 pm

NEW ShopWithConfidence Thu Jan 15 2026 2:20 PM EST

NEW SocialProofMessage Tue Apr 15 2025 7:17 PM EDT

NEW SoldAndShippedBy Mon Jul 14 2025 5:04 PM EDT

NEW SoldAndShippedBy Tue Apr 15 2025 2:23 PM EDT

New!

More savings, less stress.

HSK_Subscribetosave_E_v2

NEW SubscriptionOptionsModule Tue Apr 15 2025 6:44 PM EDT

NEW SubscriptionPriceMessage Wed Apr 23 2025 6:48 PM EDT

NEW Variants Wed Apr 23 2025 11:01 PM EDT

[Sticky] BuyBoxAd Mon Aug 11 2025 3:59 AM EDT

[Sticky] PriceInformation Mon Jul 14 2025 4:03 PM EDT

Syndigo

True

dWeb: L1/L2- Comparison Chart- WK 07, 2026

#000000

Item Carousel - Rich Relevance 1

RR carousel

Item Carousel - Rich Relevance 2

RR carousel 2

Item Carousel - Rich Relevance 3

Milwaukee 48-89-2329 1/2-Inch Thunderbolt Cobalt Drill Bit

Brand

Designed for extreme durability and long life. For specialty drilling in hard metals like stainless steel. Parabolic flute form clears chips and debris fast to keep the bit cool. Ideal for drilling on curved surfaces. 135 degree split point tip starts on contact to keep the bit from walking for fast accurate holes. Thick core provides strength and protects against side load breakage. Milwaukee 1/2 In. Cobalt Red.

Universal Product Code (UPC check)

<!DOCTYPE html>
<html>
   <head>
      <meta name="viewport" content="width=device-width, initial-scale=1">
      <link
         rel="stylesheet"
         href="https://unpkg.com/tachyons@4.12.0/css/tachyons.min.css"
         />
   </head>
   <body>
      <div class="flex flex-column justify-center w-100 ph3 normal lh-copy pt1">
            <div class="tc">
               <img src="https://i5.walmartimages.com/dfw/8822aef6-7abe/k2-_f4ee767f-a90a-4f70-be39-71e5d7b238a0.v1.jpg">
               <h3>4 equal payments</h3>
               <h4 class="gray">Buy what you love and split the cost. It's that easy. </h4>
            </div>
            <ul>
            <b>
               <li>Add item(s) to your cart.</li>
               <li>
                  Add items to checkout and choose 
                  <image height="14" width="auto" src="https://i5.walmartimages.com/dfw/8822aef6-7abe/k2-_f4ee767f-a90a-4f70-be39-71e5d7b238a0.v1.jpg"></image>
               </li>
               <li>Enter your debit or credit card information. </li>
               <li>Your first payment is taken when the order is processed, and the remaining 3 are automatically taken every two weeks.</li>
            </b>
            </ul>
            <p class="gray">Please note that a higher initial payment may be required for some purchases. Pay later in 4 <a href="https://cdn.klarna.com/1.0/shared/content/legal/terms/0/en_ca/paylaterin4" target="_blank">terms</a> available here. For Quebec residents, these Pay Later 4 <a href="https://cdn.klarna.com/1.0/shared/content/legal/terms/0/en_ca/paylaterin4_quebec" target="_blank">terms</a> are applicable. </p>
      </div>
   </body>
</html>

What is the recommended cutting speed for this drill!? Also do I need a pilot hole?

Cutting data

milwaukeetool.com

So far my experience with these bits has been pretty decent, they are a little brittle but that's to be expected for CO bit. If you properly use the drill bit you'll have no problems.

not as bad as everyone else makes them out to be

These are some fantastic drill bits if you know how to properly drill the various types of metal that most of these reviews are about.  I have not had an issue with these for either sharpness or tensile strength.  With proper technique these bits have lasted just as long as some of my higher dollar sets.  For the price these are my go to for not in the shop work (In the tool bag on sites or on the road).  Purely because I don't want to carry around a massive set of bits.

Definitely a solid set of bits if used properly!

I can't reccomend this set enough! I'm an electrician that does a lot of work in the food processing industry. I do a lot of panel builds and site installations so I deal with mostly stainless steel panels. These bits drill through stainless like butter and they stay sharp! Absolutely worth the price considering the time and effort they save!

Best Drill Bits I've Ever Used!

You would think, being a Milwaukee product, that this bit would be high quality. It's not. I had to purchase three of them just to put ~20 holes in 1/4" steel (yes, using low speed and keeping the bit lubricated). The first bit only drilled 6 holes before it was completely dull...the second one, only 2. I'm beyond disappointed in this product and have submitted a complaint asking for a refund of the two additional bits that I shouldn't have had to buy.

DO NOT BUY

3/8 Red Helix bit worked exceptionally well!  I think many users that gave bad reviews did not use cutting fluid or too high of a drill speed.  On my drill press with fluid for each hole, straight and clean holes were  drilled through over 30 pieces of 1-1/2" x 1/4" steel flat bar with long chips and no issues.  The same result through 1/4" & 3/8" thick steel angle.  Very impressed with the dual cutting angles and how effective they are drilling steel.

Great results on mild steel!!!!

Terrible, package states hard metal, it should have said only for wood or plastic. These bits are horrible for hard metal. Save time and money buy a better m rated cobalt but for hard metal

Steer clear of these bits for hard metal

Kelly Blasi

1/8 or 5/16 they broke after one or two uses.  I ask a young Milwaukee Rep is this is common for the cobalt bits and it there was a warranty for such an expensive product that breaks this easy. He said 'no', he will check into it and that I should go to the Service centre.

They break too easy in mild steel

They are sharp but not strong. I bent 3 different size bits drilling in metal.

Sharp but not strong