This 1U Server Rack Depth Adapter Kit Works For Expanding Or Reducing The Equipment Mounting Depth By 4.4 Inches In Server Rack, Network Cabinet And Rackmount Equipment. Product Size: 1U High, 4.4 Inches Deep, 1.5 Mm Thickness Loading Capacity: If The Adapter Kit Is Used In A Two Post Installation, The Extenders Can Support A Total Loading Weight Of 10 Lbs. If The 2 Sets Of Extenders Are Used In A Four Post Installation, The Extenders Can Support A Total Loading Weight Of 90 Lbs. Including: 4 Sets Of M6 Screws And Cage Nuts. Made Of High Quality Spcc Cold Rolled Steel And Powder Coated For Durability. Additional Features Rack Hole Type: Square Hole (0.354 Inch * 0.354 Inch)