Our Leather Quick Release and NATO® Style straps both feature hand-selected top grain leather and 316L stainles steel. Our Racing, Rally and Gaucho Quick Release are designed with full grain leather. They are designed to fit any traditional timepiece or smart watch with an 16mm, 18mm, 19mm, 20mm, 21mm, 23mm or 24mm lug width. Unsure how to fit a band to your timepiece? Check out our Fitting Guide or table of Common Smart Watch Lug Widths.