This Endmill watch band with a curved solid end pieces perfectly fit Seiko Black Sumo SPB125J1, Sumo SBDC001, SBDC003, SBDC005, SPB103J1 & Padi Sumo SBDC049 models. Endmill - stainless steel watch bands are composed by half-moon shape solid links and structured by screw fixed adjustable details. Considering the comfort and sustainability, it bends smoothly following your wrist. Solid 316L stainless steel links are assembled with screws instead of flimsy pins to keep its solidity and stability. The lug of this watch band was tapered into 18mm buckle size, added value on flexibility of using your original 18mm Seiko clasp back if you want. This item includes one pair of FAT spring bar (Generic Seiko Dia. 2.5mm spring bar) to ensure a more secure connection. Here introduce the latest technology of metal coating - "Diamond-like carbon" DLC coating. DLC is very resistant to abrasive and adhesive wear making it suitable for use in wristwatch accessories that may experience extreme contact pressure in rolling or sliding contact. The extreme hardness, wear-resistance, and slickness of DLC coating make it an ideal coating to apply to stainless steel watch bands. Accompany with 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 thickness. This unique aftermarket watch band tailor made for Seiko Black Sumo SPB125J1, Sumo SBDC001, SBDC003 & SBDC005.