Bluemoona Metal Snap Fastener Leather Rapid Rivet Button Setting Tool 12mm 1/2" Sewing 100 Sets (Gun Black) Size: Cap diameter 12mm Color:Nickle, Gun Black, Bronze, Gold, Gray Silver,Mixed(5 Color Each 20 sets) Tools: 1 Lower Part Base, 1 Male Tool, 1 Female Tool Each set of Snap includes 4 parts: 2 caps 1 stud and 1 socket Use for decorating your fabric, bags, Shirt, shoes, etc.