Wheel Nut Indicators

21mm Check Point Indicators. Checkpoint Indicators visually indicate nut movement. Place in a recognisable pattern such as point to point, any movement of the nut is clearly visible at a glance. This assists the visual inspection of wheel nuts, identifying when a nut loosens, to prevent the wheel from coming off. It also melts at a specific temperature, 125 deg Celsius, to highlight any overheating issues with the wheel or application.