0.8mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm, 2.4mm, 3.0mm, 3.2mm. Please confirm the size you actually need before buyingOne-piece structure design, High quality material, sturdy and durable, more safer than plastic models. The 3-jaw chuck is well-made, and the built-in spring is stable and durableThis 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 toolCompatible for all tools and flex shaft. But except discontinued Models 1, 2, and Series 1 or earlier of discontinued Models 260, 270 and 280color:Gold+silver+blackMaterial:MetalPackage Contents:8 x Brass 4485 Collets (0.8mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm, 2.4mm, 3.0mm, 3.2mm)2 x Metal replacement collet nuts1 x Keyless ChuckOnly 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.