The Faithfull 4mm Hexagon Allen Key is a popular medium size suitable for countless applications across various trades and industries. This is the smallest size to feature chamfered edges, which protect both the key blade and socket fittings from damage during use. The 4mm size is commonly encountered in machinery, automotive work, furniture, and general mechanical assemblies. Constructed from fully hardened chrome vanadium steel, this 4mm key delivers professional-grade strength and durability.
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