Treadmill safety key: magnetic work, can work easy and quick on most treadmills.Strong clip can easily clamp to any part of your clothing and it& 39;s strong to hold.Fit to a wide variety brands of treadmill which requiring a round magnetic switch safety key.It can protect you effectively when you using treadmill.Item Name: Treadmill Safety KeyMaterial: Plastic + MagnetTotal Length: 1m/39.37" (Approx.)Diameter of Magnet Shell: 2.8cm/1.10" (Approx.)Diameter of Magnet: 1.5cm/0.59" (Approx.)Clip Length: 5.8cm/2.28" (Approx.)Clip Width: 2.7cm/1.06" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Treadmill Safety Key