: This treadmill wrench is made of ABS plastic, and not easily damaged, suitable for long-term use by runners. Sturdy Clip: Easily clips to any part of your clothes, very sturdy. It can be easily attached to almost any clothing, simple and practical. Magnetic suction: racing safety lock, automatic , magnetic suction, sports equipment, compact and easy to use. Automatic device: This lock is an automatic device for the treadmill. When the safety switch exceeds the detection area of the treadmill, Running Opportunity will immediately stop working and sound a prompt to users from falls and injuries during exercise. EASY TO INSTALL: The treadmill safety key fits perfectly with most treadmills that require a round treadmill key and is small, lightweight and easy to install.