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. There are four sizes of brass 4485 collet to choose: 1/8inch, 3/32inch, 1/16inch, 1/32inch. This replacement brass collet provides a big improvement in 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., Weight: 0.04850169764 pounds, Manufacturer: Jaywool