- Rack rail kit
31" Universal Rack Rails are designed for deep server racks. These rack rails can be installed into racks with square, round, or threaded holes. Rackmount equipment weighing up to 45 lbs (20.4 kgs) can be installed using this universal rail kit. The 31" Universal Rack Rail kit is 30.6" (777 mm) deep and can be installed into server racks with installation depths up to 39.5" (1003 mm).