ITEM NAME:C12-ER16-100 Straight Shank Collet Chuck Holder CNC Milling lathe Extension T4J7 C12-ER16-100 Straight Shank Collet Chuck Holder CNC Milling lathe Extension T4J7 Extension rod diameter and the other parts are precision ground to eliminate imbalances, increased stability during cutting, tighten the nut directly, high rigidity, extremely powerful clamping force C12 Shank Holding all ER16 collets Model: C12-ER16-100 Hardness: HRC46-50 Accuracy: 0.01 Shank Diameter: 12mm Length: 136mm Weight: 200g Package Included: 1 x ER cable Tsui extension rod 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 +/- 1-3 cm..C12 Shank Holding all ER16 collets. 1 x ER cable Tsui extension rod. Length: 136mm. Model: C12-ER16-100.