Most people have encountered an Allen wrench (or Allen key). It’s the L - or S -shaped tool with a six-sided head that can ...

Workers mounting photovoltaic solar panel system outdoors. Men engineers tightening solar module on metal rails with hex key, wearing construction helmets and work gloves. allen wrench stock videos & ...

Insert the short end of the “L” into the slot on the fastener. If you’ve got the right size, the wrench will fit exactly and ...