Detailed Product Description 1), Material: Brass, nickel free2), Cap size: 10mm, 12mm, 13mm, 14mm, 15mm, 17mm, 18mm, 20mm, etc3), Make up of four parts: cap, socket, stud, post( open post and close post)4), Can make your own logo on the cap and socket.5), Common plate color is available.6), High quality, reasonable price, best services.7), Suitable for garments and other accessories.