Features: _x000D_ High hardness manganese steel, long hardness life, not easy to corrosion., solid and durable to use. _x000D_ Good metal texture, comfortable surface, easy to clamp, so that the output torsion becomes larger. _x000D_ Keyless design, tightening and loosening is by hand force, which offers a quicker and easier chucking and unchucking. _x000D_ Beautiful and practical design of the surface convex and concave, so that before and after the set can effectively cope with and can reduce the shaking jacket. _x000D_ Widely used with various drill machines, milling machines, lathes, boring lathes and electric hand tools. _x000D_ _x000D_ _x000D_ Specifications:_x000D_ Condition:100% Brand New_x000D_ Material: Manganese steel_x000D_ Color: As shown in the picture_x000D_ Connecting Rod: Taper Mohs No. 3 Maximum Diameter: Approx. 23.825mm/0.9in_x000D_ Short Head Size: Taper M18 Maximum Diameter: Approx. 17.78mm/0.7in_x000D_ _x000D_ Package List: _x000D_ 1*Self Tighten Drill Chuck