Product Size: W 19 x D 2.75 x H 1.75 (1U); Fits for Standard 19 Rack. Ideal to Organize and Support the Cables Horizontally at the Back of your Network Equipment Rack. No plastic - Steel panel,Steel cover,Full metal with powder coating, much stronger. 12 Larger Slot Cable Manager Finger Duct with Cover New Disassembled Structure Not Paying the Air, but Easy to Assemble