Didn\'t work with Pro-form XP 580.This is a round treadmill magnet replacement safety key.Used on the following Treadmills including NordicTrack, Proform, Image, Weslo, Epic, Golds Gym, Freemotion, and Healthrider. Fits most models from Alliance, Pacemaster, Fitness Gear, Horizon, Bowflex, Landice, Lifespan, Livestrong, Merit, Pathfinder, Smooth, S..