Most collets used in the market are made of aluminum alloy. This material is soft and prone to wear and tear, so brass material is used for better quality. Plastic nuts may break during use, while all-metal construction effectively addresses this issue. Compatible with all rotary tools and flex shafts, except discontinued Models 1, 2, and Series 1 or earlier of discontinued Models 260, 270, and 280. This replacement brass collet offers improved precision and holds small bits more securely and in better alignment with the tool's rotation. Under high-speed operation, it maintains stability and enhances work efficiency. Package contains: 8pcs brass 4485 collets (0.8mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm, 2.4mm, 3.0mm, 3.2mm) and 2pcs metal collet nuts. Color: yellow Material: brass Package Contents: 1 set * collet set Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause slight color variations between the item in the picture and the actual product. Measurement may vary by +/- 1-3cm.