Made of carbon steel.

The surface coating is zinc plated. Blue zinc or color zinc, as your requirements.

There are many sizes, like M4/M5/M5.5/M7/M10/M19 etc., which accept customization.

A wrench like this can be used in every area of life, such as car repair, plumbing repair, bicycle repair, furniture repair, toy and musical instrument repair, and so on.