Treadmill safety key: Magnetic design works easily and quickly on most treadmills. Strong clip securely attaches to any part of your clothing. Compatible with various 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 differences in lighting and screen settings, the item's color may vary slightly from the images. Slight dimensional variations may occur due to manual measurement. Package Includes: 1 x Treadmill Safety Key