Features: 1. 100% brand new and high quality. 2. Made of high quality copper material, wear resistant and durable in use. 3. Knurled collet cap is convenient to install and disassemble. 4. Including 10pcs collets with clamping capability of 0.5-3.2mm, which can clamp different shank diameter of tools like drill bits, grinding head bits, etc. 5. Compatible with most of tools such as mini power drill, electric grinder, etc. Specification: Material: Copper Size(mm): 0.5, 0.8, 1.0, 1.2, 1.5, 1.8, 2.0, 2.4, 3.0, 3.2 Package Weight: 25g (approx.) Package List: 10 x Collets 1 x Collet Cap