ITEM NAME:12cm Length Black Precision ER-16M Collet Wrench CNC Milling B3H1 12cm Length Black Precision ER-16M Collet Wrench CNC Milling B3H1 Collet chuck: ER-16M. Precision ground and hardened . Fit most tool holders. Product Name : Collet Chuck Wrench; Material : Rubber, Metal Fit for : for ER16MClamping Nut; Color : Black Opening Size : 16mm / 0.6"; Total Size : 12x 2.2x 0.5cm / 4.7" x 0.9" x 0.2" (L*W*T) Weight : 65g Package Content : 1 x Collet Chuck Wrench 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.