3M Hookit Blue Abrasive Disc 521U is engineered for collision repair work across paint, primer, metal, and composite substrates. This 6-inch paper-backed disc delivers fast cutting action with durable E-weight backing for consistent performance and extended disc life.
The Hookit hook-and-loop attachment system eliminates the need for adhesive or clamps, making disc changes quick and tool-free. Simply press onto a compatible backing pad and you're ready to sand. The reusable attachment means no residue buildup and lower cost per use.
Ideal for body shop professionals and serious hobbyists preparing surfaces before primer application, color matching, or final finishing. Grit 36E provides aggressive stock removal on bare substrate and rough surfaces.
The Hookit hook-and-loop attachment system eliminates the need for adhesive or clamps, making disc changes quick and tool-free. Simply press onto a compatible backing pad and you're ready to sand. The reusable attachment means no residue buildup and lower cost per use.
Ideal for body shop professionals and serious hobbyists preparing surfaces before primer application, color matching, or final finishing. Grit 36E provides aggressive stock removal on bare substrate and rough surfaces.
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