Middle Atlantic SF4 Four Space Fine Perforated Security CoverEliminate the prospect of any tampering with these tough security covers. Offered in large or fine perforation styles (models S and SF respectively), each cover is 1 deep. Includes installed rubber edging that won't mar the equipment you're trying to protect. To enhance the level of security, use our security rack screws. FEATURES Allows sight of LED's most secure. 4 sp. (7) fine perf. pattern.