Prevent unwanted access and protect your equipment with lockable door covers. The covers are designed with 63% perforation required by OEM manufacturers. The front and rear door covers can be secured with a padlock for additional security. Padlock is not included and must be purchased separately. The padlock must have a 3/16" diameter shackle with 1/2" horizontal clearance. The slot for the optional lock is located on the bottom piece of the rack. When attaching the door covers, the padlock must be looped under and over the 2 holes (slots).