The FitBar Beater Bar is an excellent upper body and obstacle trainer. The bars on the FitBar Beater Bar do not rotate about their respective axis, so they are excellent training for grip strength. As opposed the Grip Wheel which has soft hand grips that rotate and are easier on the hands, the Beater Bar quickly builds hand callouses, a must if you are looking to toughen up your hands in preparation for an obstacle course race (OCR) or a ninja course competition. It’s also great for building upper body strength, as it requires one arm to overcome the resistance of the other arm while suspending your body weight. The Beater Bar installs in seconds on any 1 3/8” diameter or smaller pull up bar or pull up rig. The attachment hooks include a safety bars that keeps the Beater Bar in place. Plastic sleeves keep the Beater Bar in place. The Beater Bar is 24 inches wide and requires the bar to be at least 8” from a wall. The center shaft hangs down 7.5 inches from the bar it is mounted on, and it effectively puts the user’s hands 13” below the attached bar. The current World Record for the maximum number of Grip Wheel reps (the rotation of a triangular element in either direction constitutes a rep) is 84!