This Hexad watch band with a curved solid end pieces perfectly fit SEI MM300 Prospex Marinemaster SBDX001 / SBDX003 / SBDX005 / SBDX017 models. Hexad watch band is a striking design first launched in recent years. Each link is composed of 3 massive Chamfer edge solid 316L stainless steel units and a curved solid end piece. Hexad is a contemporary version of the traditional O Boyer watch band, but more thick & sturdy over 100 grams. Considering the comfort and sustainability, it bends smoothly following your wrist. Well-made 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 18 buckle size, added value on flexibility of using your original 18 SEI clasp back if you want. The lug of this watch band was tapered into 18mm buckle size, added value on flexibility of using your original 18mm SEI clasp back if you want. This item includes one pair of FAT spring bar (Generic SEI Dia. 2.5mm spring bar) to ensure a more secure connection. 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. Hexad watch strap is a good choice of SEI watch band replacement for your MM300 Prospex Marinemaster SBDX001 / SBDX003 / SBDX005 / SBDX017 models. Item number: SS201820B054Brand Name: HexadLug width (mm): 20Buckle size (mm): 18Buckle Include: YesBuckle type / Buckle Finish: 316L Stainless Steel Solid V-Clasp Double Lock Buttoned Diver Clasp, BrushedOverall Length (mm): approx. 185Thickness (mm): 4.6Spring bar hole dia. (mm): 2.50Design to fit : SEI Prospex Marinemaster 300m SBDX001 / SBDX003 / SBDX005 / SBDX017Material: 316L Stainless Steel, all solid links include end linksColor / Finish: BrushedMax. length (mm): approx. 185Corresponding Min. length (mm): approx. 94Net Weight (gram): approx. 113Lug end style: Curved EndAdjustment type: 8 Screw fixed links & 6 micro holes on claspWatch Bands Lookbook demo watches by Strapcode: SEI Prospex Marinemaster MM300 Diver Automatic SBDX017