A description of all the exhibited items is made as objective as possible.  In the specification, there are technical, physical and other characteristics.  Are listed all defects and deficiencies.  I am always ready to answer your questions honestly and impartially. WHEEL THICKNESS: 1 3 mm HOLE DIAMETER: 6 mm DIAMOND DEPTH: 2,0 mm GRIT: 120 . CONCENTRATION: 100   Grinding of synthetic diamond is used for glass, ceramic, marble, granite, hard alloy tools.   Discount for the combined shipping I will add a tracking number in EBAY  Delivery times depend on courier services, and not on me.  "Please do not shoot the pianist. He is doing his best." Oscar Wilde .