These are copper(not copper plated base metal) solid rivets. Copper Solid Rivets are a good choice for electrical properties and corrosion . Copper rivets and fasteners are often utilized in manufacturing applications due to their strength after cold-heading, corrosion , and properties. We increases the strength of our copper products by the cold forming process, making it an ideal fastener for your requirements. Due to its decorative appeal, copper is an ideal material for manufacturing functional items, and its conductivity makes it perfect for use in electrical applications. Product Name:Copper Solid Rivet Material: Copper Diameter(D):2mm(5/64 inch) Length(L):3mm(1/8 inch) Head Diameter(A):31mm(1/8 inch) Head Thickness(B):16mm(1/16 inch) Color:Copper Tone Net Weight:37g Package Content:200 x Copper Solid Rivet Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.