Includes two digital indicators to true side-to-side and up-down simultaneouslyùno more guesswork Lightweight, yet rigid, aluminum frame and axel fits wheels from 16ö - 21ö with 20 mm - 30 mm axles Threaded cones on axle keep wheel more secure than cones with index screws Stand's base has adjustable rubber feet to maintain level axle Flexible mounts fix indicators exactly where needed Professional truing stand for more precise results. STAND TRU/BALNCE DIAL MSE