Super-O Boyer watch bracelet is composed by 3 flat and solid 316L stainless steel units and a curved solid end piece perfectly fit Seiko Sumo SBDC001, SBDC003 and SBDC005 models. Screw-in adjustable details instead of pressure pins. This item includes one pair of FAT spring bar (eg. generic Seiko Dia. 2.5mm spring bar) to ensure a more secure connection. Tapered 20mm lug into 18mm buckle size. Accompanied with 2015 new released V-Clasp double lock buttoned divers 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 and chamfer edged design to giving a more massive look. Chamfer double locks divers buckle is ideal for watch band with thickness approximate 4.0 - 5.0mm. Super-O Boyer watch bracelet is a good choice of Seiko replacement watch band for your SEIKO Sumo SBDC001, SBDC003, SBDC005, SBDC031 and SBDC033 models.