Remind: The 5/8-11 Female Thread Arbor velcro backer/pad holder are with water feed hole, can be used for wet polishing. Remind: velcro backer’s max capacity / velocity is 5000RPM, please don’t use it with high speed polisher/grinder. This package carries (a)-(c). (a) 1 Piece of 4″ Very (super) Flexible Rubber Backing Pad (with 5/9″-11 Femae Thread arbor). Super flexible rubber backer pad are designed for connecting polishing tool and polishing pads. It is thin and super flexible, more suitable for polishing edges. The connection is 5/8-11. We use top quality Hook and Loop Self adhesive. It will not peel off. Pad Holder’s max velocity / capacity is 5000 RPM. Please do not use it with high speed grinder or polisher. (b) 1 Piece of 4 (100mm Diameter) Diamond polishing Buffer for natural granite marble (it brings natural granite marble mirror like polished result). (c) 49 Pieces of 4 / 100MM Diameter Pad for granite marble concrete travertine they can be wet or dry use. Wet use make its life longer. The 49 Pads are. 8 X Grit 15 50 100 200 400. 3 X Grit 800. 2 X Grit 1500 3000 6000. Recommend 2800 – 5000 rpm (grinder or polisher speed must be lower than 5000 RPM). Wet or dry use (wet use recommended).