These Faithfull Hexagon Sockets are professional high-quality 3/8in Drive metric sockets forged from chrome vanadium steel which is hardened tempered and satin chrome plated for corrosion protection. Faithfull sockets have a hexagon design that gives an accurate fit on both nuts and bolts and the chamfered end allows easy nut location and entry.The FAISOC3823 Hexagon Socket has the following specifications: Drive: 3/8in square. Size: 23mm Hexagon.PTDFAISOC3823