Pins are made of high-strength steel and have a hollow center. Many pins are chrome-plated to help them wear better.销由高强度的钢做成并且是空心的。很多销都是镀铬的以使他们更加耐磨。
Weldable materials: low carbon steel , high-strength steel ,medium-carbon steel, low-alloy steel.可焊材料：低碳钢、高强度钢、中碳钢，低合金钢。