Each of our Synergee Rack Attachments fit perfectly on our 2x2 Squat Rack and Power Rack (and is compatible with any other 2x2-tube racks!). Rack attachments are sold separately from the Rack, and from each other. Other attachment options include: Upgraded J Cups, Upgraded Safety Arms, Plate Storage, Landmine, Dip Station, and Barbell Holder. Equip your rack with everything you need for a strength, gymnastics, and metabolic conditioning workout! Plus, the storage attachments will add organization to your gym space.