Premium Quality: The sanding discs are made of high quality zirconium oxide metal particles, which have high abrasion resistance and hardness and last longer than ordinary aluminium oxide. Cost-Effective: 2-inch quick change disc set contains 150pcs-80grits, more than enough for daily use and replacement needs, ideal for home, maintenance and construction field workers. Quick Change & Easy to Use: Simply turn the sanding disc to hold it on the mandrel for use with a suitable pneumatic drill, electric drill or die grinder (kit does not include 1/4Inch drill arbor) Strong compatibility: Quick change sanding discs Suitable for all electric drills tool, Examples: pneumatic grinder, die grinder, power drill. Wide Applications: drill sanding discs ideal for pre-treatment of metal, wood, plastic, steel and other surfaces. A must have for removing rust, paint, sanding and polishing . Colour:As Shown Material:aluminum oxide Package Contents: 150 * Sanding Discs Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.