3M 6″ 236U HOOKIT CLEAN SANDING DISCS – An aluminum oxide Hookit disc with precise hole design for improved dust extraction constructed on a “C” weight, intermediate paper backing. These discs are aggressive, sharp, fast-cutting and long lasting. Non-staining 3M Fre-Cut resists loading. Excellent for gelcoat, wood, and plastic applications. Primary markets: aerospace, marine, metalworking, woodworking. MOS: 10,000 RPM/12,000 OPM. Discs are 6″ in diameter. Sold by the box of 50 discs.