For AP Royal Oak 15400 41/42MM Watch Case Model 28MM Band Strap Connector Features: 1. Choose solid steel forging. 2. Good corrosion resistance and heat resistance. 3. High strength and toughness. 4. Seamless docking, fit the dial, solid and sturdy. 5. The total width of the strap is 28MM, suitable for 4.5MM connector; the total width of the strap is 26MM, suitable for 3.5MM connector. Specification: Size: 3.5/4.5mm Weight: 3.5-6G Material: steel Application: for AP Royal Oak 41/42MM dial connector 15400 15500 15710 Package Included: 4*Connectors 2*long screws 4*short screws Note: 1. Please allow 1-3mm error due to manual measurement. Please make sure you don't mind before ordering. 2. Please allow 1-3 grams weight error. Please make sure you don't mind before ordering. 3. Due to the different lighting of the photos and differences in monitors, the pictures may not reflect the actual color of the object. Please make sure you don't mind before ordering, thanks!