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Internal square drive 12.5 mm = 1/2 inch. With traction profile. Easy-to-grip, milled. For manual use. Surface: chrome, polished. DIN 3124, ISO 2725-1. Made in Germany . Hazet 900-18 6-point socket spanner insert. Material: chrome vanadium; surface: chrome-plated and polished; length: 38 mm; key width: 18 mm; output diameter: 25.4 mm, drive diameter: 22.4 mm, drive: internal square drive 12.5 mm Model number: 900-18 Color: chrome-plated/polished