Product name:Treadmill Safety Key Product size about : Diameter: 32mm Magnet: 13mm Diameter: 28mm Magnet: 18mm Product color: As shown in the figure Product material:ABS+Magnet product features: 1. Treadmill Safety Key: Works magnetically, works easily and quickly on most treadmills that require a round treadmill safety key. The strong clip can be tightly clamped to any part of clothing and can be easily clipped to almost all types of clothing, so it can keep you safe even when you run fast. 2. High-quality materials: Made of ABS plastic and magnets. The magnet housing size is 13mm inner diameter * 32mm outer diameter, the plastic clip size is 5.8cm * 2.8cm, and the nylon rope size is 950mm 3. Brand New Replacement: The old safety key may prevent the treadmill from turning on or make the system power unstable, our replacement key can perfectly solve these problems at a fraction of the cost. 4. Widely Compatible: This treadmill key magnet is suitable for almost 99% of treadmills, compatible with most top brands, for Alliance, for Pacemaster, for Fitness for Gear, for Horizon, for Bowflex, for Landice,for Lifespan, for Livestrong, for Merit, for Pathfinder, for Smooth, for Sole, for Sunny, for Tempo, for Xterra. for Due to the size, we cannot guarantee that it will work on all treadmills. Please see the inquiry relative to the safety key purchase, it is not applicable anyway. 5. Safety Attachment: The magnetic key replacement can be securely clipped to various types of clothing to ensure basic safety. If you fall while running, the treadmill magnet safety key will stop the machine immediately. Precautions: 1. As we all know , the different computers display colors differently, the color of the actual item may vary slightly from the following images. 2. If you feel difficult to choose the size, you can contact us at any time. We will give you some suggestions, but for your reference only. Shipment includes: 1 pc Treadmill Safety Key