Trusted by professionals, the Capri Tools high performance sockets are what you need for the job at hand Premium Chrome Vanadium steel tempered with our proprietary heat treatment process to withstand more torque SmartKrome plating, achieved through thorough polishing and careful application of chrome protective plating, ensures durability and corrosion resistance 6-point WaveDrive design grips fasteners more tightly than traditional design, preventing fastener rounding and giving you more leverage Single 1/4 in. drive, 6 mm size deep socket Capri Tools high performance sockets are trusted by professionals for even the most demanding applications. We use premium Chrome Vanadium steel tempered with our proprietary heat treatment process to make these sockets and accessories. They are durable and withstand more torque. Each socket underwent careful polishing and protective plating process to achieve our own SmartKrome finish. The 6-point WaveDrive design grips fasteners more tightly than traditional design, preventing fastener rounding and giving you more leverage. Single 1/4 in. drive, 4 mm size deep socket.