Amazon
External square drive 12.5 = 1⁄2 inch - Internal square (Robertson) drive 6.3 = 1⁄4 inches. Number of packs: 1 Package weight: 90 g Country of origin: Germany, Manufacturer: Hermann Zerver GmbH & Co. KG
Amazon MarketplaceExternal square drive 12.5 = 1⁄2 inch - Internal square (Robertson) drive 6.3 = 1⁄4 inches. Number of packs: 1 Package weight: 90 g Country of origin: Germany