Tools can be used on Angle grinder and pneumatic machine. Use on all Materials. Use wet or dry. Available in 3″,4″ and 5″ (76 mm, 100 mm and 125 mm). Rigid for straight edge polishing. Super adhesive used to prevent separation of Velcro. 5/8″-11 thread, except BPSL40T which has CNC snail lock fitting. 3,500 MAX RPM.