Features Compatible: Suitable for nut rotation of ER type shank, arbor and extension rod. Please check the size and compatibility carefully before buying, is an excellent after-sales substitute for the old model. Comfortable to Use: The handle is designed to hold the wrench tightly and saves effort during use, brings you a comfortable feeling of operation. Easy to Use: Reasonable design is convenient to use, is easy to be install, don't need to use much time on installation. High Work Efficiency: High work efficiency, long-term use is not easy to fatigue, can bring more convenience to your life. Long Service Life: The collet chuck spanner is made of high carbon steel, heat treated, high hardness, durable to use, which has long service life. Specification: Item Type: Clamping Nut Wrench Material: High carbon steel Optional Model: ER25, ER32, ER40 Application: Suitable for ER25 / ER32 / ER40 UM socket wrench Package List: 1 x Collet Chuck Spanner Package List 1 x Collet Chuck Spanner