This product is a ball bearing sliding rails built from SECC steel. The rail is built to last and can hold system weight up to 55 lbs. Increase your accessibility to your rackmount server with this easy to install rackmount sliding rails.Features1U Sliding Rail 20 in.1U Height 3 Sections Solid-Bearing Sliding RailsUltra-thin 7.16 mm. (0.281 in.) Slide ThicknessLoading Rating up to 55 lbs.Might need to drill new holes on the inner rails if the pre-drilled holes don't match with chassisSupported Cabinet 22 in. ~ 27 in. depthSupported Chassis up to 23 in. lengthL Shape Bracket - 6 in.Material of Main Chassis - 1.2 mm. SECC SteelSupported Chassis Depth - up to 23 in.Supported Cabinet Depth - 22 in. to 27 in. (front mounting posts to rear posts)