Item Type: Clamping Collet Chuck_x000D_Model: ER40(7 holes)_x000D_Size: Diameter: Approx. 80mm / 3.15in_x000D_Accuracy: 0.005_x000D_Material: Carbon steel 1FOR LATHE AND MILLING MACHINE: Clamping collet chuck can be mounted to the back plate of your choice for use on a lathe, also suitable as a chuck on milling machine 2DURABLE CARBON STEEL: Made of excellent carbon steel material, possess strong antioxidant capacity and high hardness 3FOR CNC ENGRAVER: Clamping collet chuck is suitable for CNC milling machine turning tool engraving machine, not easy to slip, very stable 4GUARANTEED QUALITY: Made after standard production, so that your products can be processed better, more efficiently, and more durable 5GOOD CLAMPING FORCE: Clamping nut holder possess stable structure, excellent performance and long service life, you can use with confidence1 x Clamping Collet Chuck