Chrome vanadium, chrome plated, polished. With traction profile.
12k mm: 11.0 length: 54.0mm diameter: 15.8mm depth: 11.0mm PROFILE: BI-HEXAGONAL SIZE / SIZE: 11 MM DRIVE: 3/8 INCH LENGTH: 54.0MM FOR IMPACT GUNS: NO MAGNETIC: YES PIN TO RELEASE: NO INSULATED VDE: NO