Made of carbon steel with ergonomic and non-slip handle, sturdy and durable(Friendly Disclaimer: GreatStarTools is the sole owner of WORKPRO brand, be careful of fake WORKPRO products, Especially Edital Store which sold) Efficient and practical: the light weight system allows one-handed use thus saving strength Two universal wrenches that adapt to all kinds of screws and nuts and automatic technology that allows them to automatically adapt to different sizes Using this set is the right solution to solve your problem of taps, valves, pipes and pipes, radiators, boilers and impellers Large adjustable wrench - length: 280mm, weight: 380g, opening size: 23-32mm, small adjustable wrench - length: 210mm, weight: 180g, opening size: 9 -22 mm and 6-15 mm Material: carbon steel Adjustable large spanner - Length: 280 mm, weight: 380 g Adjustable small wrench - Length: 210mm, weight: 180g Opening size: 23-32mmlarge) Opening size: 9- 22mm and 6-15mmsmall) Hardness: 38-48HRC Two universal wrenches that fit all kinds of bolts and nuts Efficient and convenient, with the light weight system, one hand movement is enough Ergonomic bi-material handle brings non-slip experience and can saves strength therefore elevating work efficiency The secret is the self-adjusting technology, which allows them to automatically adjust the size Ideal for assembly and repair of mechanism, plumbing, carpentry and gardening Using this set is a good solution to solve your faucet problem, valve, pipes, radiator, boiler and impeller