Level 360 SD60 60 Grit Premium aluminum oxide abrasive discs with hook & loop backing for use with Radius 360º Drywall Sander or Porter Cable 7800 Drywall Sander (Requires Power Pro Pad). 60 Grit is very coarse for drywall, and is used for aggressive sanding or leveling of difficult surfaces. Durable construction for extra sanding life. Level 360 aluminum oxide paper is clog resistant and self sharpening for longer life. Loop backed sandpaper firmly attaches to the foam disc, preventing debris from collecting behind the sandpaper, and eliminating a major cause of streaking.