Baum - 22 mm Allen Key has a black phosphate covering the Chromium-Vanadium steel base. The black phosphate layer comprises iron, zinc, or manganese phosphates. The layer is abrasive, and thus, it improves the frictional properties of the outer surface in the Allen key. The layer is highly porous; thus, it is covered with lubricant, which cuts off its contact with the atmospheric corrosive elements. The 22 mm Allen Key has a high safety limit for torsional stress and load due to its core material. Hex key or an Allen Key provides a benefit when there is little space, and the hexagonal bit sockets or wrenches become useless.
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