Pad Holder’s max velocity / capacity is 5000 RPM. Please do not use it with high speed grinder or polisher. This package carries (a)-(c). (a) 1 Piece of 6′ / 150mm Diameter velcro pad holder (5/8-11 Female Thread arbor). (b) 16 Pieces of 6 / 150mm wet dry use wet use recommended. Ideal speed of grinder when using them is between 2800 and 5000 RPM. Diameter Pad for granite marble concrete quartz travetine. 3 X Grit 50 100 200 400. 1 X Grit 800 1500 3000 6000. (c) 1 Piece of 6′ Diamond glaze buffer (it brings mirror like polished result to natural granite marble).