Feature●Good metal texture, comfortable surface, easy to clamp, so that the output torsion becomes larger.●Widely used with various drill machines, milling machines, lathes, boring lathes and electric hand tools.●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.●Self tightening keyless feature automatically increasing gripping force, high reliability, and stability.●Made of 45# steel, solid and durable to use.Description