Rail RazerUse the Rail Razer system for all of your gymnastic and cavaletti work! Raise one side of your ground poles, both sides, or stack them to increase the height of your raised cavalettis. Lightweight, durable, and perfect for your jump rail exercises! Use for building trail courses, gymnastics, and cavalettis Safely lifts trot poles for conditioning and training pole work Interlocking units to achieve the desired height Each base lifts a pole 3 1 2" off