The item is a simple and practical magnetic treadmill safety key with the diameter of 2.3cm, which fits in the round hole in the treadmill console to start the treadmill. As long as your key slot diameter is the same as 2.3cm, it will work on any brand of treadmill such as York, Bremshey, Horizon, Proform, etc. Features - Color: mainly red.- Material: duarble hard plastic and magnet.- Key diameter: about 2.3cm; Cord length: about 140cm.- and Magnetic Treadmill Running Machine Safety Key Security Switch.- Fits in the round hole in the treadmill console to start the treadmill.- The safety key will work on any brand of treadmill as long as it fits the size.- Simple and pracitcal design, and easy to use.Packing list: 1 * Replacement Magnetic Treadmill Running Machine Safety Key Security Switch - 2.3cm Diameter (Red)