Suitable for ER25 rotary clamp nut, grinding, lathe nut and most tool holders Improve accuracy greatly, save time and convenient for operation The red rubber cover handle provides comfortable hand feeling, ergonomically designed and ensures power transmission O The type tensioner is designed to drive screw strips, threaded rings and shafts. Accurate adjustments reduce risk of waves, nut and housing damage Forging with steel a toughness and wear resistant. High frequency hardened and black oxidized treatments with high hardness and corrosion resistant treatments, Manufacturer: huiouer