The Rack Mounted SquatMax-MD by Titan Fitness is a cutting edge machine that has adjustable mounting holes for various rack depths and is engineered to fit power racks with 3" x 3" steel uprights. This model is compatible with the X-3 and TITAN Series Power Racks when mounted to the center of the uprights and the T-3 Series Power Racks when mounted to the side of the uprights.