Treadmill Safety Key: The safety lock is an automatic protection device for the treadmill. Material: Made of high quality ABS, durable for a long time. Portable: Lightweight treadmill safety key, easy to use. Design: The safety lock is placed in the groove of the panel and the other end is clipped on the clothes, which is convenient to operate. Wide Compatible: This treadmill safety key is suitable for most treadmills. Round plug for Decathlon; Rectangle plug for AD; Magnetic plug for Tempo. Specification: Material: ABS Size Chart: Round: 3.2cm x 3.9cm / 1.26 inch x 1.54 inch Rectangle: 4.6cm x 2.8cm / 1.81 inch x 1.10 inch Magnetic: 4cm x 2.3cm / 1.57 inch x 0.91 inch Package Includes: 1 Treadmill Safety Key Note: Please allow slight variations due to manual measurement and differences in display monitors.