Treadmill safety key: Magnetic design works efficiently and reliably on most treadmills. Strong clip easily attaches to any part of your clothing and securely holds in place. Compatible with a wide range of treadmill brands that require a round magnetic switch safety key. Provides effective protection during treadmill use. Item Name: Treadmill Safety Key Material: Plastic + Magnet Total 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 color may be slightly different from the pictures. Please allow slight dimension differences due to manual measurement. Package Includes: 1 x Treadmill Safety Key