Feature: 1. Anti Slip Design: The chuck set adopt anti slip texture design, which can be easily tightened by hand. 2. Application: The chuck can hold most shank tools, such as drill bits, for drilling, polishing and grinding. 3. High Quality: The miniature electric grinder chuck is made of high quality brass material, which is wear resistant and durable. 4. Application Range: The clamping range is 0.5‑3.0mm, suitable for mini electric drills, electric grinders, etc. 5. Easy to Use and Replace: Suitable for most tools used in hardware, workshops, households, woodworking, etc. Specification: Item Type: Drill Chuck Set Material: Brass Clamping Range: 0.5-3.0mm/0.02-0.12in Application Scope: Mini electric drill, electric grinder, etc. Package List: 1 x Chuck 5 x Collet 1 x L Wrench Note: Manual measurement has a little error.