For mounting your 500 Series rack units, you want the proper screw for security and a proper fit. Studio engineers at Sweetwater recommend Radial Engineering 500 Series rack screws. They're properly sized, 4-40 3/8" machine screws with oval heads that fit snugly into the countersunk holes on 500 Series preamps, compressors, EQ, blank panels, etc. This is a 24-piece pack, sufficient to mount up to 12 500 Series rack units.
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