36-Piece Hex Bit Socket Set, SAE and Metric Sizes, S2 Steel Hex Bits, Chrome Vanadium Steel Sockets and Adapters with Storage Case36 Piece Hex Bit Socket Set, SAE and Metric Sizes, S2 Steel Hex Bits, Chrome Vanadium Steel Sockets and Adapters with Storage Case Rugged Strength and Durability: Hex bits made of drop forged S2 steel withstand demanding tasks and reduce fastener wear. Premium Materials: S2 alloy steel hex bits and heat treated chrome vanadium steel sockets ensure exceptional strength and longevity. CNC Machined Drill Bits: Dimensionally accurate with chamfered ends