Feature●Made of Hardened treated Chrome Vanadium Steel Alloy (Cr-V) with black-oxide finish.●Precisely-sized, chamfered ends insert smoothly into fastener head, reduce wear.●Each hex key in a size-marked hole,so you always have the size u need at-hand ,exquisite and small size.●Widely used for driving internal hexagon socket (allen head) fasteners.[SAE]
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