The TITAN Series Crossmember Stabilizer mounts on the top back of your 90 or 100-inch Power Rack, constructed from heavy-duty 3 x 3-inch, 11-gauge square steel with 2-inch hole spacing spanning the length of the 42-inch stabilizer bar. The crossmember improves the strength and stability of your Power Rack and allows you to add new workout stations, including the Lat Tower Attachment, Pull-Up Spheres, Shackles, Clock Hangs, and more.