These straps have a rugged vintage look but are also smooth and supple to the touch. The front and backs have matching calf leather which has a lightly oiled finish that will develop its own unique, weathered, worn-in look. The holes for the lug pins are reinforced with steel tubes and the buckles are available. Buckles are satin finished steel. Tongue side length: 120mm Buckle side length: 80mm (excluding buckle) Thickness: 3mm Lug Gauges (strap width at case): 18mm, 20mm, 22mm Tapers for standard lug gauges are shown below: 18mm lug gauge tapers to 16mm at the buckle 20mm lug gauge tapers to 18mm at the buckle 22mm lug gauge tapers to 20mm at the buckle The watch shown in the photograph is for illustrative purposes only.