Features: * 100% new and high quality * Polishing laps mainly used for polishing crystals, agates, gems and jade, and is suitable for grinding and polishing jewelry, glass, rocks, etc. * Diamond coating area: almost 97% * All our flat wheels laps have an outer diameter of 4" (approx.) and a hole of 5/8" (approx.) and are designed to be mechanically clamped to the main lap. Technical Data: * Product Name: Diamond Grinding Disc * Outer Diameter: 100mm (4") * Arbor Hole Diameter: 16mm (5/8") * Grit: 80#/180#/240#/400#/800#/1000 #/2000# Package Content: 1 * Polishing Grinding Disc Note:1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.