Fangrui Product Details 1. Features: 2. 1eight Size Options: Choose From Eight Collet Sizes ( 3. 8mm, 4. 2mm, 5. 5mm, 6. 8mm, 7. 0mm, 8. 4mm, 9. 0mm, 10. 2mm) To Meet Your Specific Needs, Allowing For Precise And Versatile Drilling Applications. 2brass Material: Made From Premium Brass, These Collets Are Resistant To Breakage, Lightweight, Wear Proof, And Durable, Ensuring Long Lasting Performance. 3compatibility: Compatible With All For Dremel Rotating Tools And Flex Shafts, Except Discontinued Models 1, 2, And 1 Series, Or Earlier 260, 270, And 280 Models, Providing Broad Compatibility For Various Projects. 4improved Accuracy And Safety: The Chuck Collet Set Significantly Enhance Accuracy By Allowing Better Alignment With Drill Tools, Maintaining Stability Even At High Speeds, Resulting In Improved Work Efficiency And Safety. 5complete Set: This Kit Includes Eight 4485 Brass Collets And Two Metal Nut Chucks, Providing Convenience For Daily Needs, Giving You Everything You Need In One Package. 11. Specification: 12. Item Type: Drill Chuck Collet Setmaterial: Brassweight: Approx. 21g/ 13. 7ozcollet Hole Size: 14. 8mm/ 15. 03in, 16. 2mm/ 17. 05in, 18. 5mm/ 19. 06in, 20. 8mm/ 21. 07in, 22. 0mm/ 23. 08in, 24. 4mm/ 25. 09in, 26. 0mm/ 27. 12in, 28. 2mm/ 29. 13in 30. Package List: 31. 2 Xchuck8 Xcollet