MT3-ER25 Specifically with Designed with a collet Specifications: ER25 Clamping diameter: 3-20mm Lock nut Specifications: ER25 ER Straight extension rods, longer rod body for deep hole machining. Straight handle body, for small drilling or milling tools. You can reduce the use of longer tools, which can reduce costs, improve efficiency Stable diameter and other precision-ground parts to eliminate imbalance, increased cutting of , high precision, tighten the nut straight, high rigidity, strong clamping Color: silver material: metal Package Included 1 x Extension Rod 1 x Wrench 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 +/- 1-3 cm.