High quality and durability: chrome vanadium forged, strong, durable and anti-corrosion protective. all the tools meet new ansi and asme standards. it is known as high quality and durability.For loosening and tightening bolts or screws in motoring maintenance and general domestic use 77pcs Toolset hardened tool-grade chrome vanadium steel for extra strength and durability. Sockets feature cross-knurling for improved grip and 12 contact points. Ergonomic ratchet handle with bi-material soft-grip for comfort and control. Supplied in a carry case organiser.