Most people have encountered an Allen wrench (or Allen key). It’s the L ... which reduced tool slippage. (Think of how a flat-head screwdriver slips completely off a screw, a potential hazard ...
These are the small L-shaped hand tools that come free with most ... loosened or tightened with a pocket knife or house key in a pinch. An Allen wrench, AKA an Allen key or hex key, is a small ...