21â Inchâ 12 Space Rack Caseâ Rails Model Number: SARHW04 Pair ofâ 21 Inchâ 12 Space 12U Rack Case Rails Dimensions: 1. 55 x . 68 x 21|â Threads are 10-32 Construction: 11 Gauge Steel - Cold Rolled | Sleekâ Black Powder Coat Finish Perfect replacement for PA/DJ Rack Cases, Road Cases or ATA Cases Theseâ rack case railsâ are ideal for adding to your rack, road, or ATA case as well as replacing existing or damaged rails. Theâ universal fit and black powder coat finish make these railsâ a perfect accessory to your Rack case. You can never have enough of these in your toolbox, so have some extra on hand and be ready for all the road throws at you!