Sandpaper Discs. These floor sanding discs have a 2″ center hole. They are for use with all 17″ 175 RPM floor machines with a 17″ sandpaper driver. Above all the sharp silicone carbide minerals are ideal for removal of old finishes, paint, varnishes, etc. Likewise these heavy duty sandpaper discs are attached to a durable cloth/paper backing. Packed 20 disc per case.