Baum - 4 mm Allen Key is an alternative to the wrenches and bit sockets. These 4 mm Allen Keys are shaped like an L handle, but these are much smaller and slim. In addition, the Allen Key provides a tight fit in the grooves of the hexagonal socket screws and bolts. These screws are a better option because of their high load-bearing capacity, and thus Allen keys become more important. The short end of the Allen key goes into the groove, and the long end is the power application end.
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