Screw lock: The clip with the screw on the back is light to attach and will NOT easily fall off the objects to which it is attached. You can use the extendable lanyard with the clip attached to your belt buckles, bags, lanyards, backpacks and other portable bags. Thickened Steel Wire: The upgraded steel wire of the extendable keychain is thickened, which is much larger and stronger than others. The diameter of the key roll is 4 cm. The steel wire is approx. 70 cm long. Because it is upgraded, it is not easy to break. Professional Design: The retractable cord allows you to swipe your ID card without removing it. You can also open doors without removing the keys from your belt. This will make your life much more convenient. High quality material: Metal-zinc alloy design, corrosion-resistant, wear-resistant, durable, thickened steel. After tens of thousands of tensile tests, the steel wire is not easy to break. Excellent quality can greatly improve the service life of the heavy-duty key fob. Wide ApplicationBecause the key roll key fob can be used to attach a badge holder, ID card holder, keys, etc., it is suitable for employees, nurses, staff, sports events, security guards , Police, Military, Government, Teachers, Students, Administrators , Factory Workers, Clerks, Outdoor Enthusiasts etc.