BBOSTITCH BSA8207M 4-12-Inch x 78-Inch Z60 T29 Flap Disc ReviewbP PP BOSTITCH BSA8207M 4-12-Inch x 78-Inch Z60 T29 Flap Disc PZirconia grit enables 3X faster material removalPPremium abrasive cloth provides up to 15 X longer lifePType 29 fiberglass backing provides grinding angle of 20-25 degreesP