Replacement For Square, Non-Magnetic Keys: Don?t let a lost key stop you from using your treadmill - our standard-sized treadmill key is an ideal fit for over 2,000 treadmill models that utilize square, non-magnetic treadmill keys. Comparable to OEM part numbers 119038 and 119039. Does not work for treadmills requiring a round or magnetic key. Safety Key Measures 1 1/16? in width and 2 1/16? in length | Compatible With Many Models But Not All: Compatible with many specific models from a variety of manufacturers that use a square non-magnetic key, including compatibility with select models from Weslo Cadence, Proform / Pro-Form, Nordictrack, Lifestyler, Horizon, Healthrider, Reebok, Softstrider, Sportcraft, iFit and many more. Does not work with models that require a round or magnetic key | Made To Last: Made from rigid ABS plastic with a high-quality braided cord, our replacement treadmill safety key is designed to stand up to the constant use of even the most frequent runners / walkers. Easily clips to virtually all types of clothing so you can forget about the key while you walk or run | Does Not Fit models that utilize a round magnetic key from Alliance, Crosswalk, Epic, Fitness Gear, Landice, Lifespan, Livestrong, Merit, Pathfinder, Smooth, Sole, Sunny, Tempo, Triumph and Xterra. If you have one of these models, please check or ask a question before ordering | Please send us a message through our seller page if you have any compatibility questions before purchasing the key. This is Not a Round Or Magnetic Key. This a square, non-magnetic key