Their arbor is 5/8-11 Female Thread. Grinder or polisher speed must be lower than 6500 RPM when using with them. This package carries (a)-(d).
(a) 1 Piece of B20 (20 mm / 3/4", for 20 mm / 3/4" high / thick stone concrete). Radius / Demi / Roundover Shape Bullnose Diamond Brazed Router Bit/Profile for. 20 MM Thick or High granite concrete travertine (5/8-11 Thread arbor). (b) 1 Piece of 4" Velcro Pad Holder 5/8"-11 Thread arbor.
Velcro Backer's max velocity is 5000 RPM Please do not use it with high speed grinder / polisher. 16 Pieces of 4 Inch Diamond Polishing Pad for stone concrete.3 X Grit Grit 50 100 200 400. 1 X Grit 800 1500 3000 10000. (c) 7 Pieces of 1 3/8 Diamond Wet Dry use Polishing Drum. 1 X Grit 50 100 200 400 800 1500 3000. They have 5/8-11 Thread arbor.