A server rail kit consists of two sets of inner and outer rails. The rails are universal; that is, each set of rails can be used for either the left or right side of the server.
In a new server rail kit, the inner rails are nested inside the outer rails. You need to separate them so that you can attach the inner rails to the server and the outer rails in the rack.
The following figure shows an inner rail nested inside an outer rail.
The following figure shows the inner and outer rails separated from each other. The outer rail is on top.
The word FRONT is stamped on the top and bottom lips of each outer rail at the front of the rail. The word REAR is stamped on the top and bottom of each rail at the rear of the rail.
At the rear of each outer rail, the letter L is stamped on one lip and the letter R is stamped on the other lip. With the letter L facing up, the rail goes on the left side of the rack, when viewed from the front of the rack. With the letter R facing up, the rail goes on the right side of the rack.