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AME CheckMate Loose Lug Nut Indicator is the gold standard for vehicle pretrip inspections. The high visibility yellow easily indicates when a lug nut is loose. It will point in a different direction than the others. This simple feature helps prevent would could be a potentially fatal and costly wheel off incident. Simply install the CheckMate indicators after proper torque is achieved, point them in the direction of rotation, and visually check them during pre-trip inspections and through the day. Comes in multiple sizes.