Fits rail up to 3 inches x 1-3/16 inches

The ROTOZIP GP8 1/8-Inch Guidepoint Drywall Cutout Zip Bit is for clean cut material up to 1-inch thick

This is a strong nitrile built to stand up to tough applications

and eliminates the need to change brushes

Norton 9" Back Up Pad Mustang Fits rail up to 3Back up pad provides extra support to a right angle grinder, enabling the use of heavier pressure when sanding Works with 9" diameter Norton A290 hook and loop discs for Porter Cable drywall sander, model 7800 (sold separately) Hook and loop abrasive discs can be removed and reattached multiple times with no loss of adhesion, which can increase abrasive disc life