Cooperation with the world wide recognized “HARDLOCK Industry Co., Ltd.“ that is known for the creation of the Ultimate Vibration Proof Nut, has given birth to the “Hard Lock Lug Nut” which prevents loosening of the “Tension Bolt”. HARDLOCK Industry’s “Hard Lock Lug Nut” was designed to provide safety and security to high-risk, critical applications like railways, roads, bridges, and skyscrapers, and now we’re bringing this technology to your kit. The “Hard Lock Lug Nut” achieves a powerful locking effect using the traditional Japanese “wedge” principle to prevent loosening. Adjustable with just the tuning key, this nut provides the security and stability you need when failure is not an option.