MA1 Modular Cross Rig Monkey Bar - 1.8m This 1.8m Monkey Bar can easily slot into any cross beam that features monkey bar receivers. A must have for those who are interested in getting a monkey bar section on their cross rig. Also available in 1.1m lengths. This is a 1.8m monkey bar that is compatible with all of our MA1 Modular Rig Accessories and Parts.