40PCS of Zirconium corundum and a free holder, 36 60 80 12 10PCS each, of 41PCS. The sand dish is 2 inches in diameter and 1.5 mm in thickness. The pallet diameter matches the sand dish by 2 inches.Zirconia Corundum Sand Disc: The high quality zirconia abrasive particles are attached to the surface of the abrasive cloth by electrostatic sand planting. The effective grinding aids are added to the surface of the zirconia corundum to prevent loading and reduce heat accumulation. Abrasive cloth can x cloth and Y cloth, which can increase the elasticity and hardness of the sand dish. for use carbon steel, cast iron, titanium, aluminum, brass, , copper, or hard as as heat materials such as stainless steel, alloy or cobalt alloys. Feature Male Type R - Quick / Roll Off fastening system and are meant to be used with a 2-inch backing pad that can then be attached to any inch power drill, air grinding tool, or die grinder.Zirconium corundum abrasive grain has high abrasion resistance and hardness. The surface is attached with thermal and blocking resistant coating, which can the grinding efficiency and service life. cloth base with high toughness cotton backing cloth makes dish more elastic and suitable to plane and side grinding, also increase plastic links with the disc. The black plastic knob is made of PE without adding recycling material. High toughness will not off.Quick change disc has unique safety screw, strong wear resistance and fast grinding force. It can grind high-quality metals, such as shipbuilding, car , aviation, machinery and so on. Be used for grinding welding seam, surface finishing, deburring, inverted circle and mirror, Surface polishing.Name:Quick Change Discscolour:blueMaterial:ZirconiaSize:2 inch(50mm)Grit:36 60 80 120 Package Contents:40 * Quick Change Disc1 * Quick change Disc PadOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.