Fire box provides a method for emergency gate access Accepts Knox 3501 key switch which can be purchased from Knox Company (Not Included) Box has ample room inside for placement of gate release keys as a backup to the micro switch 14 Gauge steel box powder coated bright red Dimensions: 6" (H) x 5 1/2" (W) x 3" (D) - .75" inch in diameter The EFB-2010 Fire Box has an ace cylinder lock with an additional hole to accept a Knox 3501 key lock, which can be purchased from Knox Company website. The knox company will send a cylinder Model 3501 that is keyed for your local fire department please note each city has a different keyed lock so you will need to enter the installation address in order to receive the correct lock. Please note that this box dose not include the Knox key lock must be purchased separately from the Knox company.