Eliminate the prospect of tampering with these tough security covers. Offered in regular perforation styles, each cover is 1in deep. Includes installed rubber edging that won't mar the equipment you're trying to protect. To enhance the level of security, use the patented Guardian Series security bit and HSK rack screws.Eliminate the prospect of tampering with these tough security covers. Offered in regular perforation styles, each cover is 1in deep. Includes installed rubber edging that won't mar the equipment you're trying to protect. To enhance the level of security, use the patented Guardian Series security bit and HSK rack screws.