Drop-forged, Chrome Vanadium steel combination spanners.Hardened and tempered with a hard chrome finish for corrosion resistance.15° Offset ring ends keep knuckles clear of obstructions.35° Angled offset open end allows for improved access.Feature specially machined flutes in the walls of the ring end which enable use on up to 85% rounded fasteners.This not only provides added strength but also prevents further damage to worn or rusted fixings.