Specifications:  Type: Spring Collet Chuck;  Model: ER40;  Material: Steel;  Gripping Range: 2/ 3/ 4/ 5/ 6/ 7/ 8/ 9/ 10/ 11/ 12/ 14/ 16/ 17/ 18/ 19/ 20/ 21/ 22/ 23/ 24/ 25mm.     Features:  -ER Collet Chuck:It is a cylindrical fixture used to confine drilling and tapping tools or milling tools on the spindle of a drilling, tapping, milling machine or machining center. It can also be used to fix and reinforce the parts that need to be modified;  -Durable & Practical:ER spring chuck has large clamping force, wide clamping range and good accuracy. Special angled slots increase rigidity. Protects tool holder from contaminants;  -Wide Application:Suitable for boring, milling, drilling, tapping, engraving, CNC, spindle machines, and other processing.     Package Included:  1 X Spring Collet Chuck