3M 5" 236U HOOKIT CLEAN SANDING "C" WEIGHT DISCS – An aluminum oxide Hookit disc with a precise hole design that can evacuate dust better than 5 or 6-hole products – for improved dust extraction. Constructed on a "C" weight, intermediate paper backing. Cut isn’t compromised as the design achieves an ideal balance between abrasive and dust extraction holes. CW Array Hole Pattern. Primary markets: marine, metalworking, woodworking. For use with 3M PN# 20206 Backup Pad. Disc is 5". Product is sold by the box of 50 discs.