4" Diamond 3 Step Polishing Pad 1" stone ceramic marble porcelain core drill bit
(5/8"-11 Female Thread arbor. Wet use make its life longer). (a) 1 Piece of 4" PVC Velcro Pad Holder (5/8"-11 Female Thread arbor). 1 Piece of STEP 1, STEP 2, STEP 3. Pad Holder's max velocity / capacity is 5000 RPM.