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3M Hookit Blue Abrasive Disc 321U delivers best-in-class performance at every stage of paint prep and body repair.
Premium aluminum oxide mineral abrasive is blended with ceramic grain for a full range of automotive sanding applications.
Specially-designed multi-hole pattern reduces loading, extends disc life and aligns with most backup pads. Hookit attachment makes disc changes easy.Features. Engineered ceramic mineral blend is balanced for maximum abrasive performance in its class. On-board Unit Conversion Calculator. Anti-loading coating prevents dust and debris from clogging the cutting surface. Upgraded resins improve durability and finishSpecifications. Color: Blue. Diameter?: 5''- SKU: MDCO28267