The Sliding Rails for the Dell T7600, T7610 and T7910 mounts in any EIA-310, 19" rack with square, round or threaded holes. The tower is secured to the rails with screws on the side of the chassis. The Sliding Rails for the Dell T7600 has a mounting depth range of: 12 - 31" (304 - 787 mm). Thumb screws allow rails for the tower to be secured to front of the rack. Cage nuts are required for square hole racks.