Made of carbon steel with ergonomic and non-slip handle, solid and durable Efficient and practical: the light weight system allows one-handed use therefore 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 fix your faucet, valve, pipe and pipe, radiator, boiler and impeller problem Large adjustable wrench - length: 280mm, weight: 380g, opening size: 23-32mm, small wrench adjustable - length: 210 mm, weight: 180 g, opening size: 10-22 mm and 8-15 mm Two universal keys that adapt to all kinds of bolts and nuts Efficient and practical, with the light weight system, one hand movement is enough < p> Ergonomic bi-material handle brings a non-slip experience and can be saves strength thus elevating work efficiency The secret is the self-adjusting technology, which allows them to adapt the size automatically Ideal for mechanism assembly