The universal magic wrench is made of high-carbon steel to ensure that the wrench is rust-free and durable. Both sides are coated with plastic for more comfortable use. After heat treatment at 600°C, the wrench jaws become hard, and the hardness is not easy to damage. There are springs on the hook, which saves more effort, and the surface is polished to stainless steel, which is more beautiful. Material: Carbon steel.