There are four sizes of brass 4485 collet to choose: 1/8inch, 3/32inch, 1/16inch, 1/32inch. This material is soft and easy to wear and tear, so we use a better quality brass material. For plastic nuts, they break during use, and the all-metal material solves this quality problem very well. Compatible with for all rotary tools and flex shaft. But except discontinued Models 1, 2, and Series 1 or earlier of discontinued Models 260, 270 and 280. This replacement brass collet provides a big improvement in precision and holds these tiny bits far more securely and in better alignment with the rotation of the tool, under high-speed rotation, it not only maintains stability but also improves work efficiency. Material:Brass + Metal colour:Gold+Silver Package Contents: 8 x Brass 4485 Collets (1/8inch x 2, 3/32inch x 2, 1/16inch x 2, 1/32inch x 2) 2 x metal replacement collet nuts Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.