Chrome vanadium, chrome plated, polished, American dimensions. With traction profile.
12kt mm: 7/16 length: 38.0mm diameter: 16.4mm depth: 10.5mm PROFILE: BI-HEXAGONAL SIZE / SIZE: INCH 7/16 DRIVE: 1/2 INCH LENGTH: 38.0MM FOR IMPACT GUNS: NO MAGNETIC: YES PIN TO RELEASE: NO INSULATED VDE: NO