The 45.5mm lug-to-lug profile means the watch sits compactly on the wrist without extending past the edges, making it ideal for smaller to medium wrists (around 15 cm to 18 cm). For reference, the model number SBDL085 represents the Japan Domestic Market (JDM) version, which shares the exact same dimensions as the international/US version, reference SSC813 Key DimensionsCase Diameter: 39.0 mmLug-to-Lug Distance: 45.5 mmThickness: 13.3 mmLug Width (Strap Size): 20.0 mmTotal Weight: 161 grams (including the steel bracelet) Brand: Seiko Watch Size: 40mm Material: Stainless Steel Movement Type: Solar Features: Chronograph