KGS Back-up pad with velcro, standard for KGS Diamond Polishing Discs Color-coded per grit size Very handy during grinding and polishing with multiple grains Center hole for center water feed tools Threaded arbor is 5/8” -11 4” diameter, rigid plastic adapter, 5/8”-11 threaded arbor faced with velcro hook. These adapters are available in a full range of colors to facilitate easy grit identification, eliminating the need to remove the tool from the adapter to identify. A 3/8” hole allows center water feed, essential for wet grinding applications. Colour: Brown (which represent grit: 10,000 / Buff)