15-100 Sets Heavy duty Rivet Poppers Snap Fasteners Press Stud Clothing Sewing Leather Craft Heavy duty Poppers Popper Cap Size : 12mm, 15mm or 17mm Color choose from : Silver, Gold, Antique Brass, Gunmetal Black, Glossy Black, Matt Black, Material : Brass ( non-rusting) These Poppers are widely used in Clothing, Jeans, Leather Craft, etc. To use these poppers, you should have the fixing tool that's available here Each Sets includes 4 parts : Front(Cap), Female(Socket ), Male(Stud) and Back(Post) For the 15mm or 17mm, choose #201 For the 12mm, choose #203 Go to search on YouTube: How to use handheld tools to set up heavy duty poppers -- leather craft, sewing, crafts Size Details: Cap diameter Tool Type # to use Cap length Socket diameter Stud diameter Post diameter Post length 12mm #203 5mm 11mm 11mm 11mm 6.7mm 15mm #201 6mm 13mm 13mm 12mm 7mm 17mm #201 6mm 13mm 13mm 12mm 7mm 12mm Just short of 1/2 Inch 0.47244 Inches 15mm Just short of 5/8 Inch 0.59055 Inches 17mm Just short of 11/16 Inch 0.66929 Inches