It will fit the 31mm Rolex Midsize watch which has 17mm lugs. 17MM 18MM 19MM 20MM 21MM 22MM 23MM 24MM 26MM. Strap is 17mm at lugs and 16mm at the buckle and you can interchange with the buckle. This Strap is made of genuine premium Italian leather, high quality leather with alligator decor and thick 4.5mm padding for nice look.
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