Running Machine Safety Key Treadmill Magnetic Switch Lock $ 7.37 This is a treadmill security lock. Almost Fits for all the treadmill. Cord Length: 84cm Diameter of magnet shell: 2.2cm Diameter of magnet: 1.3cm This is a treadmill security lock. Almost Fits for all the treadmill. Cord Length: 84cm Diameter of magnet shell: 2.2cm Diameter of magnet: 1.3cm Color: Red