The high strength impact grade chrome vanadium steel sockets can withstand stronger torque and assure longevity. Premium black phosphate coating provides maximum protection from rust and corrosion, better than traditional black oxide finish. A special customized heavy-duty case to provide you easier storage. TKL Drive Deep Impact Socket Set Improves Efficiency 3/8-Inch/Metric/14Pcs Sockets/2Pcs Extensions. 6-point socket design, Socket depth, Laser etched size, High-strength chrome vanadium steel, Corrosion-resistant black phosphate Coating, Organized storage case 14Pcs Sockets : 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 22mm 2Pcs Extensions : 3" , 5.9" 2Pcs Extensions: Made of high quality chrome vanadium steel with premium black phosphate finish. Designed for all cordless, electric and pneumatic impact wrenches to reach narrow spaces, Spring-loaded ball detents lock set to prevent parts from slipping into machinery Laser Etched Size Laser etched markings on the sockets make it easy for size selection, even in low light High-torque and Accurate 6-point socket design grips the flat sides of fasteners, not just the corners, preventing round-of Compact and Solid Case