Most collets used in the market are made of aluminum alloy. This material is soft and prone to wear and tear, so brass is used for better quality. Plastic nuts may break during use, while all-metal construction effectively resolves this issue. Compatible with all Dremel rotary tools and Dremel 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 securely holds small bits with better alignment. During high-speed rotation, 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 * Dremel collet set Only the above package content; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual item. Measurement may vary by +/- 1-3cm.