Verktyg för vridning av sexkantiga muttrar och bultar

摘要

A wrench for rotating hexagonal fasteners includes an opening defined by a sidewall. The sidewall includes a plurality of contact surfaces for contacting respective sides of the fastener. Each contact surface includes two groups of generally parallel ridges separated by a recessed portion. Each of the ridges has a convexly curved top for contacting a side of the fastener.