Pack 15 Sets 12.5/15/17mm Silver Snap Fasteners w/tool Press Studs Sewing Buttons F Jackets, Jeans, Bags, Straps Other Sewing Projects Clothes Repair (15mm 15 Sets w/Tool(Long Post)) Widely used for leather craft, handbags, clothing, leather straps, jackets, Jeans etc. Material: Brass (non-rust); Size: 12.5/15/17mm (front part); Color: Silver ; Supplied by sets (each set includs 4 parts: Front, Female, Male and Back) ;Pack supply 15 sets snap with tools; You need to use the hammer to work with the tools;