Size: Round metal plate: 42mm diameter, 0.5mm thick. Square metal plate: 45.5mm * 65.5mm, 0.5mm thick. Compatible with almost all 4.2 to 5.6 inch smartphones. These are metal plates that fit magnetic car phone holders. The magnets are strong and rigid enough. Includes 4 plates (2 round and 2 square), which can be used as spares or shared. Uses 3M super strong double-sided tape, which adheres strongly and is difficult to remove. Very convenient for replacing plates when changing phone models or when you have multiple devices. Please allow approximately 24 hours after application before use to ensure maximum adhesive strength. ⭐ Instant purchase OK! Free shipping ⭐ The site photos are for illustrative purposes; please check the actual photos. #Nao's product list is here ✨☜ 33-37 Mount Metal Plate Magnetic Car Mount Cradle-less Mount Replacement Kit for Phone Holder (Black, Set of 4)