Specifications] Quartz Quartz 【Japanese movement】 10 ATM water resistance Calendar Chronograph Material] Case : Stainless steel Belt : Rubber Size] About H55 x W46 x D12 mm (approx. H55 x W46 x D12 mm) Belt arm circumference: Max. 22cm / Min. 16cm (approx. 16cm) Smallest hole in our staff with approx. 165mm arm circumference, a little tight when worn.