Manufactured from hardened Chromium Molybdenum Steel for strength with a black manganese phosphate finish for protection. Lighting & Security. US PRO Industrial. Will fit head sizes: 1/4", 5/16", 3/8", 10mm, 7/16", 12mm, 1/2", 13mm, 9/16", 5/8", 17mm, 11/16" and 3/4".
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