GetRX’d CrossFit pull up system. No bar The Alpha HD Pull-Up Bar System is an updated version of our original Alpha Pull-Up Bar. It's made out of heavier steel - 11-gauge to be exact - for more sturdiness and durability. The Alpha HD is still an all-purpose wall or ceiling mount pull-up bar system. It is both convenient for any space-conscious athlete and even more stable for all pull-up variations. You also have the added option to purchase the brackets and the bar together or just the brackets, should you choose to use your own bar. The square 2" x 1" tubing and 1.25" diameter bar (sold separately) make both kipping and strict pull ups easier to string together. Chin-ups and muscle-ups can also be practiced should you feel the urge to show off in front of your friends.