0.8mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm, 2.4mm, 3.0mm, 3.2mm. Please confirm the size you actually need buying One-piece structure design, High material, sturdy and durable, more than plastic models. The 3- chuck is -made, and the built-in spring is stable and durable This replacement brass collet provides a big improvement in precision and holds these more securely and in better alignment with the rotation of the tool Compatible for all tools and flex shaft. except discontinued Models 1, 2, and Series 1 or earlier of discontinued Models 260, 270 and 280 color:Gold+silver+black Material:Metal Package 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 nuts 1 x Keyless Chuck Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.