The item is a simple and practical magnetic treadmill safety key with a diameter of 2.3 cm, designed to fit into the round hole in the treadmill console to start the machine. As long as your key slot diameter is 2.3 cm, it will work with various treadmill brands such as York, Bremshey, Horizon, and Proform. Features: - Color: Red - Material: Durable hard plastic and magnet - Key diameter: Approximately 2.3 cm - Cord length: Approximately 140 cm - Magnetic treadmill safety key and security switch - Fits into the round hole in the treadmill console to start the treadmill - Compatible with various treadmill brands if the size matches - Simple and practical design, easy to use Packing list: 1 x Replacement magnetic treadmill safety key with security switch – 2.3 cm diameter (Red)