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 FAISOC3815 Hexagon Socket has the following specifications: Drive: 3/8 inch square. Size 15mm Hexagon. FAISOC3815