[Strong Clip] : Magnetic Safety Switch can work easy and quick on most treadmills requiring a round treadmill safety key. It can easily clamp to any part of your clothing and it's strong to hold. [Universal Compatibility] :Designed as a universal treadmill magnetic lock, this key fits most treadmills with a round safety key slot. Whether for home or commercial gyms, it ensures seamless compatibility. [Durability] : Manufactured with and craftsmanship, this Rtreadmill Safety Key Replacement offers stable performance to meet all your workout needs. Made of ABS and magnet materials, it provides durability and long-lasting reliability.