Tool insert e.g. bits etc. for conventional socket wrenches has two axially opposite square bores for square parts of ratchet spanners etc.

摘要

The tool insert is for box/socket wrenches to act as drive for cutting internal screw threads. The tool has two axially opposite square bores of different sizes (a,A). One bore accommodates the square drive part of a conventional wrench bit (ratchet spanner, toggle, or extension). The opposite second bore accommodates the square part of a conventional tapping drill.