Chrome vanadium, chrome plated, polished. With traction profile.
12k mm: 16.0 length: 60.0mm diameter: 21.8mm depth: 16.0mm PROFILE: BI-HEXAGONAL SIZE / SIZE: 16 MM DRIVE: 3/8 INCH LENGTH: 60.0MM FOR IMPACT GUNS: NO MAGNETIC: YES PIN TO RELEASE: NO INSULATED VDE: NO