High Carbon SteelER32 socket wrench is made of high quality high carbon steel, with high hardness, wear resistance and durability. Ergonomic handle designThe chuck wrench handle accords with ergonomic design, comfortable and labor-saving. High precisionThe hook wrench has precision ultra-high, it is the perfect tool for professionals and amateurs with high-quality work results. EfficientThe collet chuck wrench is reasonably designed, easy to operate and very effective. You can work with it for a long time without fatigue. ApplicationThe precision chuck key is suitable for turning ER type tool holders, tool holders and extension rods . 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 key