It goes in a 16mm hole. It also has a metal siren button date plate included that you could stick on the dash of your vehicle and then mount the button through it! (the siren button screws into pace and that will hold the data plate in place). For other areas please ask. The item "Willys Jeep Ford GPW WW2 Siren Federal Champion MARS Sirene 6V small" is in sale since Friday, September 6, 2019.
This item is in the category "Vehicle Parts & Accessories\Military Vehicle Parts". The seller is "nicenewdukebits" and is located in Bristol. This item can be shipped worldwide.