Redefine Durability 3M™ Cubitron II Depressed Center Grinding Wheels Type-Q • Grinds Faster • Lasts Longer • Runs Smoother   RSH ID D x W x Center Hole        RPM     051115-78469 4 x 1/4 x 3/8 15,300   051115-78468 4 x 1/4 x 5/8 15,300   051115-78466 4.5 x 1/4 x 7/8 13,300   051115-78467 5 x 1/4 x 7/8 12,250   076308-64314 6 x 1/4 x 7/8 10,200   076308-64315 7 x 1/4 x 7/8 8,500   076308-64316 9 x 1/4 x 7/8 6,650   RSH ID D x W x Center Hole      RPM     076308-64320 4.5 x 1/4 x 5/8-11 13,300   076308-64317 5 x 1/4 x 5/8-11 12,250   076308-64318 6 x 1/4 x 5/8-11 10,200   076308-64319 7 x 1/4 x 5/8-11 8,500   051125-87153 9 x 1/4 x 5/8-11 6,650 Limit One Free Sample Roll Per Customer