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 the Edital Store which sold) Efficient and practical: the light weight system allows one-handed use thus saving strength Two universal keys that adapt to all kinds of screws and nuts and automatic technology which allows them to automatically adapt to different sizes Using this set is the right solution to solve your problem of faucet, valve, pipes and piping, radiator, boiler and wheel Large adjustable wrench - length: 280mm, weight: 380g, opening size: 23-32mm, small adjustable wrench - length: 210mm, weight: 180g, wheel size #39;opening: 10-22 mm and 8-15 mm Two universal wrenches that fit all kinds of bolts and nuts < p> 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 thus