MT3-ER25 Specifically with Designed with Collet Specifications: ER25 Clamping diameter range: 3-20mm Locking nut Specifications: ER25 ER Straight extension rods, shank body longer for deep hole machining. Straight-type handle body, for holding small drilling, milling tools. You can reduce the use of longer tools, which can reduce costs, improve efficiency Stability diameter, and other parts have been precision ground to eliminate unbalance, increased cutting of Durable, high precision, tighten the nut straight, high rigidity, strong clamping Color: silver material: metal Package Included 1 x Extension Pole+1 x Spanner 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.