Ringke band metal one strap works with Apple Watch Series 9 / 8 / 7 (41mm) Apple Watch Series SE2 / 6 / SE / 5 / 4 (40mm) Apple Watch Series 3 / 2 / 1 (38mm) The solid chain structure design provides smooth integration between the smartwatch and watch band. Adjust the length of the band to match your wrist with the easy-to-use resizing tool. Max band circumference of 18.8cm.