3M 00076308650537 - 3/8" MAX ROLL DIAM X 1" OAL, 320 GRIT ALUMINUM OXIDE STRAIGHT CARTRIDGE ROLL - 3/8" MAX ROLL DIAM X 1" OAL, 320 GRIT ALUMINUM OXIDE STRAIGHT CARTRIDGE ROLL 1/8" PILOT HOLE DIAM, VERY FINE GRADE, X WEIGHTED CLOTH BACKING, 24,000 MAX...