Checkpoint 29 MM Wheel Nut Indicator with Overheat Alert - Sparex Part S.166551The Checkpoint Original S. 166551 wheel nut indicator is a simple yet highly effective safety solution designed to visually identify wheel nut loosening. Developed as the first product of its kind, it promotes routine maintenance and reduces the risk of wheel detachment on heavy duty vehicles and equipment. This set includes 100 indicators, each sized for 29mm wheel nuts. The high visibility polymer design not only shows rotational movement but also