The set of item includes a box of 360pcs stainless steel watch band double-flange spring bars, and a box of 360pcs stainless steel watch band link cottor pins. The watch band spring bars & link cotter are made of high-grade stainless steel material for durable to use, and specially used for metal watch strap links for easy to use. Features 360pcs Stainless Steel Watch Band Double Flange Spring Bars Strap Link 6mm-23mm - - Material: durable stainless steel. - Pin thickness: about 1.0mm. - and Stainless Steel Watch Band Link Cotter 6mm-23mm. - 360pcs Watch band link cotter in 18 different sizes, and each size includes 20 pieces: 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm. - Stainless Steel watch spring bars with double shoulders, used for metal watch strap links. - Those watch link are kept in a transparent plastic box for keeping the 18 different sizes separated and easy to access. Package list: 3 * Box of 360pcs Stainless Steel Watch Band Double Flange Spring Bars Strap Link 6mm-23mm 3 * Box of 360pcs Stainless Steel Watch Band Link Cotter 6mm-23mm