DIN 3124, long form, chrome vanadium, chrome-plated, polished. With traction profile.
12kt mm: 21.0 length: 85.0mm diameter: 28.6mm depth: 18.0mm PROFILE: BI-HEXAGONAL SIZE / SIZE: 21 MM DRIVE: 1/2 INCH LENGTH: 85.0MM FOR IMPACT GUNS: NO MAGNETIC: YES PIN TO RELEASE: NO INSULATED VDE: NO