Sturdy and Durable: This rack mount adapter is constructed from cold rolled steel,electrostatic powder coat preventing rust and corrosion Compact & Lightweight: Depth adapter kit provides an efficient way to store and organize equipment without consuming excessive space Space Saving: Use this adapter can add additional accessories to the device,10lbs(4.5kg) for 2-post installation, 90lbs(40kg) for 4-post Easy to use:Rack extender is easy to install,with instructions or videos for reference;Complete accessories includes M6 Cross screw×4, M6 washer×4, M6 Cage nut×4 Widely Applicable:EIA/ECA-310 Compliant;1U, 2U Recessed rack adapter with different depth 4, 6 are available; Suitable for NVR, dell ready rail, switch, router, SFP modules in data/audio/IT rack