Shank diameter: 10mm Shank length: 100mm The diameter of the extension rod and the other parts are precision ground to eliminate imbalance, increasing safety during cutting. It can reduce the use of extension tools, which can reduce costs and improve efficiency. The spring collet has high clamping force, wide clamping range, high accuracy. Widely used in drilling, milling, boring, tapping, grinding and other processing. Color: silver + black Material: Steel Shank chuck model: C10 ER8A 100L Spring collet clamping range: 2MM to 5MM (2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm) Spring collet MODEL: ER8 Package includes: 1 x Straight shank chuck 7 x Spring collet Only the above package content, other products are not included. Note: Light shooting 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.