21.5mm Hexad Oyster 316L SS Watch Bracelet for Seiko Tuna, Diver Clasp, PVD Black Shipping Estimate : 7 - 10 Business Days within US. Material: 316L Stainless Steel, all solid links include end links Metal Finish: PVD Black Generic Seiko Dia. 2.5mm spring bars included Design to fit : 2009 onward Seiko Tuna models' replacement watch band?s such as SBBN013