[Wide Compatibility: EEEKit red magnet key for treadmill works seamlessly with most treadmills that require a round key and offers excellent versatility. However some treadmill models have larger built-in magnet diameters. Note: This round magnetic key replacement is not compatible with NordicTrack or ProForm models Secure Attachment: The magnetic design ensures quick connection with most treadmills that require a round safety key. If you move too far from the console the magnetic running machine key will disconnect and stop the treadmill ensuring safety during exercise Premium Materials: This treadmill emergency stop key is made of ABS plastic featuring a nylon rope and a magnet. The plastic clip measures 1.1 x 1.6 in the magnet housing has a diameter of 1.2 in and the nylon rope is 39.4 in long. Note: The treadmill stopper magnet diameter is 0.59 inches—check compatibility before purchasing Easy to Use: The magnetic connection allows for quick installation and removal letting you focus on your workout. The strong clip securely attaches to virtually any clothing ensuring a reliable connection and safety during exercise Perfect Replacement: Old safety keys can prevent your treadmill from turning on or cause power instability. Replace it with our red treadmill emergency stop safety magnet for walking pad ensuring reliable treadmill working]