An improved hammer driver includes a body with an outward flange on a lower portion thereof, a removable socket member adapted to driving a nut or bolt, a rotary member interconnecting the body and the socket member and including a radially extending rotary arm for being actuated to rotate the socket member, an impact member slidably sleeved on the body above the outward flange for sliding axially on the body to hammer against the outward flange, and a transmission device for rotating the rotary member and hence socket member when the outward flange of the body is hammered by the impact member.

Technical Details
ONE-HANDED, AUTOMATIC HAMMER
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