Tripp Lite 4POSTRAILKIT1U SMARTRACK Series 1U Universal Adjustable Rackmount Shelf Kit

I used this set of 1U rack shelf rails to properly support the weight of a 1U Tripp-Lite SMART UPS mounted into a 4-post cabinet. Pros: It works as intended. Cons: Some of the tapped threads were not deburred so I had to file the rough edges down. Also, the box was missing the screws and washers which I felt are essential for securing the rails into square-hole rack rails. Tripp-Lite did send me the missing parts after calling them. Advice: I don't recommend using cage nuts to hold these rails into place. It just doesn't feel as secure. Use the provided screws and cone washers instead. Also, double check the depth of the rails you need as Tripp-Lite sells two different sizes.