Tripp Lite Rack Enclosure Square Hole Hardware 50-Piece Kit with 12-24 Screws and Washers Components SRCAGENUTS1224 Square hole hardware kit - 50 each 12-24 cage nuts and bolts Fastens equipment to square hole rack mount rails Compatible with all square hole racks (EIA 310D) Package includes: 50 pcs 12-24 cage nut zinc, 50 pcs 12-24 pan head screw, 50 pcs PVC black cup washer 5-year limited warranty