CABSCREWM5B Startech M5 Cage Nuts and Screw - 12 mm Rack Screws and Cage Nuts - 50 Pack - Black - Replacement Serve Rack Screws (CABSCREWM5B) - Porcas e parafusos da prateleira - preto - para P/N: RACK-18U-20-WALL-OA, RACK-21U-20-WALL-OA, RACK-24U-20-WALL