Each backlap kit includes our premium blended 80 grit backlap compound, 2″ application brush, and adapter specific for Tru Cut 20″ and Tru Cut 25″ Reel Mowers. The backlap adapter works with a standard drill and enables you to perform your own sharpening between relief grinds. Backlapping will not work on reels with a flat edge, only relief ground edges.