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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 FAISOC3821 Hexagon Socket has the following specifications: Drive: 3/8in square. Size: 21mm Hexagon.Additional Information:• Socket Type: Hex• Size (mm): 21