Screw driver bit for electric screw driver has screw head contact section with drive bars and triangular projections on bars

摘要

Bit (1) has shaft (1.2) at one end for fitting into screw driver, and conical section (1.1) at other end, to engage with cross head screw (2). Conical section has drive bars (3) with individual triangular projections (4) on their backs near ends. Bit is dimensioned, so that gap width (S) between outer bit face and inner face of recess (2.1) in screw head corresponds to height (H) of projection.