These Jendyk Locking Wheel Nuts keep the tires and rims on your heavy-duty truck or trailer with only one wheelok nut (M22 x 1.5 thread with 33mm Hex) per exterior tire. The innovative and virtually indestructible design of this wheelok nut and key offers security that can’t be compromised. Can be installed with high-torque pneumatic air gun (450–500 ft.-lbs.) by replacing one existing non-locking wheel nut per tire. Each lock has a free spinning sleeve that prevents its removal with vise grips or similar tools. These locking units help you avoid increased insurance costs, downtime, delays and vehicle damage by thieves. Made in U.S.A. from certified, tested and hardened alloy steel.