Middle Atlantic Fine Perforated Fixed Security Cover | Rack Units: 4 RUThe Middle Atlantic Fine Perforated Fixed Security Cover eliminates the prospect of tampering with these tough security covers. Offered in fine perforation styles, each cover is 1 deep. Includes installed rubber edging that wont mar the equipment youre trying to protect. To enhance the level of security, use the patented Guardian Series security bit and HSK rack screws.