Chrome vanadium, chrome plated, polished, American dimensions. with traction profile
6-kt.-inch: 5/16 Length: 25.0mm D-mm: 11.5 T-mm: 6.3 PROFILE: HEXAGONAL SIZE / SIZE: INCH 5/16 DRIVE: 1/4 INCH LENGTH: 25.0MM FOR IMPACT GUNS: NO MAGNETIC: YES PIN TO RELEASE: NO INSULATED VDE: NO