1. FOR LATHE AND MILLING MACHINE: Clamping collet chuck can be mounted to the back plate of for use on a lathe, also suitable as a chuck on milling machine 2. CARBON STEEL: Made of excellent carbon steel material, possess strong antioxidant capacity and high hardness 3. FOR CNC ENGRAVER: Clamping collet chuck is suitable for CNC milling machine turning tool engraving machine, not easy to slip, very stable 4. GUARANTEED QUALITY: Made after standard production, so that your products can be processed better, more efficiently, and more 5. GOOD CLAMPING FORCE: Clamping nut holder possess stable structure, excellent performance and long service life, you can use with confidence Item Type:Clamping Collet Chuck Model:ER40(7 holes) Size: Diameter: . 80mm / 3.15in Accuracy: 0.005 Note:Before inserting the collet chuck, the collet must be assembled into the collet chuck nut. Color:As Shown Material:Carbon Steel Package Contents: 1 * Clamping spring chuck Only 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.