| 摘要 |
A hexagonal wrench is provided with three equally spaced grooves of varying depth adjacent an end of the wrench to define three flat side ball-shaped members, the end ball of which is adapted to be inserted in a complementary hexagonal socket of a screw-threaded member. The grooves vary successively in depth with the groove furthest from the end being the shallowest groove so as to provide increased resistance to breakage. A modified hexagonal wrench is comprised of a stub shank of hexagonal cross-sectional configuration secured to an end of a flat elongated strip to facilitate operation of the wrench in areas of small clearance.
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