Asus RS100-E5-PI2 - Manual (Page 41)

3-5 ASUS RS100-E5-PI2
8. Firmly hold the server on both sides. Slide the latches on the inner rack rails
to the direction indicated below. Hold the latches, and insert the rear side of
the server to the front end of the outer rack rail.
Make sure that the inner rails are properly aligned with the outer rails.