Each house number package comes with an instruction template, follow the instructions, you will easily find the right place for the holes. Drill three holes with a drill and insert the plastic caps into the holes. Then fix the number and the metal sealing ring with screws. You will have a perfect House Number. High quality zinc alloy material, and the surface is plated with black coating, not easy to rust and break and can withstand the toughest conditions, which means they are extremely durable, you can buy in any confidence. Modern house numbers have an elegant and sophisticated style that is also easy to read. Thanks to their delicate design, they appear to magically float when viewed from the front; the classic modern address number will give you a magic floating effect after installation. These floating street numbers can be widely applied as front door numbers, mailbox extension numbers, apartment or condo numbers, also suitable for yard, outdoor, garden, office, to hotels, factories, address plaque, etc. Note: The data are all manual measurement, please allow 1 - 3cm error, due to the difference of light and display, there will be a certain color difference, depending on the physical object received.