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, operates easily and quickly on most treadmills that require a round treadmill safety key. The strong clip can be securely attached to clothing and is compatible with various types of apparel, helping ensure safety during use. 2. High-quality materials: Constructed from 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. Replacement function: Can serve as a replacement for worn or damaged safety keys that may cause operational issues, providing reliable performance. 4. Widely Compatible: Designed to fit most treadmills requiring a round safety key, compatible with many popular models including Alliance, Pacemaster, Fitness Gear, Horizon, Bowflex, Landice, Lifespan, Livestrong, Merit, Pathfinder, Smooth, Sole, Sunny, Tempo, and Xterra. Due to variations in treadmill designs, compatibility cannot be guaranteed with all models. Please verify fit before purchase. 5. Safety Attachment: The magnetic safety key attaches securely to clothing. In the event of a fall, it disengages to stop the treadmill immediately. Precautions: 1. Colors may vary slightly due to differences in monitor displays. 2. If you have questions about sizing, please review product specifications carefully. Shipment includes: 1 pc Treadmill Safety Key