Chrome polished, heavy duty alloy steelMeets or exceeds federal GGG-w-636E and ANSI B 107.6 specifications for hardness, torque, and toleranceV-notch cut grips fasteners on all four sidesIncludes 10, 11, 12, 13, 14, 15, 16, 17, 18, and 19 mm wrenches in storage case
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