"3M 051141 20752 6"" Clean Sanding Disc 150 Grit When the dust clears it's the cut that remains. Improve productivity clean and simple. Featuring 3M-patented, precise multi-hole patterns, these discs can evacuate dust better than 5- or 6-hole products - which can dramatically increase disc life. 3M 051141 20752 6"" Clean Sanding Disc 150 Grit Features: An aluminum oxide Hookit disc with precise hole design for improved dust extraction constructed on a ""C"" weight, intermediate paper backing MOS: 10,000 RPM/12,000 OPM 150 Grit A sub-model of 3M 236U Box of 50"