"Designed to contact the spoke nipple on all four sides to help prevent nipple collapse and rounding. Made from chrome vanadium tool steel with satin-chrome finish. This 6 1/4"" long spoke wrench has a 1/2"" wide offset line wrench type ends and rounded edges for quick use and is easy on the hands. Wrench openings measure 6mm (.234"") and 6.3mm (.250"") that fits all OEM size spoke nipples and most aftermarket size nipples. Sold each."