4 ues:used for indoor and outdoor construction field
3 finish:such as bright, zinc plated, yellow zinc plated
2 diameter: M3 to M30 to be made by cold forming, M33 and up to be made by hot-forging.
1 material:our nuts are made of carbon steel, alloy and stainless steel, aluminum, brass, and other special materials.
features:
hex cap nuts