Designed for secure, long-lasting fastening, these 15mm 4-Part PRYM Stainless Steel Press Studs include a cap, socket, stud, and post for a complete closure solution. Manufactured from premium stainless steel, they provide excellent strength, corrosion resistance, and smooth everyday performance. Compatible with the PRYM SP3 machine, they install quickly for professional results on jackets, bags, purses, straps, leather goods, garments, and a wide variety of sewing and craft projects.