Specification Brand : uxcell BulletPoint1 : [Size]: 11mm/16mm/16mm/16mm/19mm/20mm diameter drill bits. The shank of 2.35mm diameter. BulletPoint2 : [Material] - Made of silicone material, which has a good grinding effect and long-lasting performance. BulletPoint3 : [Portable] - Lightweight, small size, easy to carry, this set of grinders drill bit can provide convenience for your polishing work. BulletPoint4 : [Usage] - It can be installed with electric drills, electric grinders, or other rotary tools for quick fine polishing to make the polished goods cleaner and brighter. BulletPoint5 : [Application] - Suitable for grinding metal, jade, ceramics, glass, non-metallic surfaces, hardware accessories, etc. CompatibleMaterial1 : Glass CompatibleMaterial2 : Metal CompatibleMaterial3 : Ceramic FinishType : Finish IncludedComponents : inc ItemName : uxcell Mounted Grinding Bits Grinder Heads Different Head Shapes Silicone Polishing Wheels for Rotary Tools Multi-Size 6pcs ItemPackageDimensions_Height : 14.9 centimeters ItemPackageDimensions_Length : 2.3 centimeters ItemPackageDimensions_Width : 10 centimeters ItemPackageQuantity : 6 ItemTypeKeyword : power-rotary-tools Manufacturer : uxcell Material : Silicone MaximumRotationalSpeed : 15000 rpm MinimumSpeed : 5000 rpm ModelNumber : a20111400ux0221 NumberOfItems : 1 PartNumber : a20111400ux0221 PowerSourceType : PowerSource ProductDescription : Description : 1. Made of silicone material, which has a good grinding effect and long-lasting performance. 2. Lightweight, small size, easy to carry, this set of grinders drill bit can provide convenience for your polishing work. 3. It can be installed with electric drills, electric grinders, or other rotary tools for quick fine polishing to make the polished goods cleaner and brighter. 4. Suitable for grinding metal, jade, ceramics, glass, non-metallic surfaces, hardware accessories, etc