The 19 inch racks are designed for the ultimate in configuration flexibility The 6061-T6 high-strength aluminum alloy makes ICC racks light weight and durable, with excellent grounding characteristic. The 19 inch standard racks include: Roll-tapped threading 12-24 standard on both front and back Two angled top cross-members for maximum strength 30 high -quality. Pilot point screws Pre-installed steel-threaded grommets minimize stripping during assembly. Slotted hole design on the base for easy adjustment. Compatible with any cabinet or rack that conforms to EIA-310-D spacing standard specifications. The 19" relay racks are offered in 4 and T-foot heights and in naturaluminum and Power-coat electrostatic black finish. All racks are provided with all assembly hardware including equipment screws. They are designed with mounting holes for anchoring rack to the floor. Assembly hardware included. Easy to assemble. Double rolled cross braces for added stability.