Baum - 27 mm Allen Keys are useful in confined spaces. These work like a wrench, and the Allen key's long arm provides a mechanical advantage. The long arm multiples the force and delivers this turning force to the short arm of 27 mm Allen Key. The Allen Key uses chromium-vanadium steel as a raw material. The Allen keys owe their high strength to the steel alloy and protect black phosphates' outer covering. The protective rust-resistant black layer usually comprises manganese, iron, and zinc phosphate salts.
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