Material: Durable 304 stainless steel. Compared with normal stainless steel, it is safer, more durable, non-toxic and corrosion resistant. It is of high hardness and not easy to deform. It can be used in the outdoor humid environment. Size: M10 Package: 4 (More dimension details please refer to the picture) Feature: Easy to install and remove , can be used repeatedly. Usage: Turn the nut by hand without any other tools, easy to install. Applications: Machinery and equipment, electronic equipment, communication equipment, hardware lighting, building construction bridges, furniture decoration, etc.