Most collets used in the market are made of aluminum alloy. This material is soft and prone to wear and tear, so we use higher-quality brass material. Plastic nuts may break during use, while all-metal construction effectively resolves this issue. Compatible with all rotary tools and flex shafts, except discontinued Models 1, 2, and Series 1 or earlier, and 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: 8 pcs brass 4485 collets (0.8mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm, 2.4mm, 3.0mm, 3.2mm) and 2 pcs 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 and the image. Measurement may vary by +/- 1-3 cm.