MA1 Modular Cross Rig Cross Beam with Monkey Bar Receiver - 1.1m Set your custom cross rig with this 1.1m cross beam with monkey bar recieve slots. Set with 4mm thick steel, the modular cross rig parts are thick and sturdy. Ideal for functional strength training, cross rigs are an impressive look for your gym and your clients will be eager to give it a shot. Now you can custom build your own with your space and budget.