... Unitized DiscMinitype abrasive material for hand polishing machine, it has the same feature which other Non-woven abrasive materials have, be ... is 16mm or 12mm, and there are two covers of the hole, metal core and plastic core. Its hardness is P5, ... it is not convenient for big abrasive machine,such as the angle of the metal polishing.Feature:No blockage, good brightness, excellent polishing effect ...