Endmill brushed solid 316L stainless steel watch bracelet is design for 2009 onward Seiko Tuna models such as SBBN013 or other 21.5mm lug Seiko diver or sport watch case with straight lug. Generic 2.5mm diameter Fat stainless steel spring bars included. All soild links including end links in half-moon shape are structured by screw fix adjustable details instead of common pins. Accompanied with 2015 new released V-Clasp double lock buttoned diver's clasp. V-Clasp was made from solid 316L stainless steel with extra 6 micro holes for flexible fine tune length adjustment. Featured in V shape safety lock, streamlined form & chamfer edged design to giving a more massive look. Chamfer double locks diver's buckle is ideal for watch band with thickness approximate 4.0 - 5.0mm. Today replaces your Seiko Tuna into this unique aftermarket watch bracelet.