Review on 🔧 SilverStone Technology Rack Mount Server 1U/2U Support (RMS01): Optimal Solution for Efficient Server Organization by Timothy Jimenez

"Tool-less" serrated clamps add about 75mm to a 20" depth and make it impossible to mount on a flatter rack (although at 21.5" I had plenty of room). Despite the table on the Silverstone website for these rails listing dimensions for 18" rails, they also don't appear to exist. If you don't have a square hole rack, it comes with screw hole adapters, but using these will reduce your depth by an additional 48mm (two on each side). Max is just over 28-1/4", whatever that is otherwise they mount perfectly and move smoothly.