DIN 3124, chrome vanadium, chrome-plated, polished. With traction profile.
12kt mm: 18.0 Length: 38.0mm Diameter: 25.4mm Depth: 14.0mm PROFILE: BI-HEXAGONAL SIZE / SIZE: 18 MM DRIVE: 1/2 INCH LENGTH: 38.0MM FOR IMPACT GUNS: NO MAGNETIC: YES PIN TO RELEASE: NO INSULATED VDE: NO