Product FeaturesCompatibility: Equipped with dedicated metal connector lugs designed specifically for Apple Watches, allowing it to slide smoothly right into the casing mechanism without using tools.Sizing: The retail packaging explicitly labels it for 38mm/40mm/41mm Apple Watch casing profiles.Design Details: It utilizes a classic silver stainless steel tang pin buckle closure and features dual keeper loops to keep the excess length securely pinned against your wrist