Checklink® – A dual-purpose wheel nut indicator and retainer. Placing a Checklink® across two adjacent nuts helps to prevent the loosening of wheel nuts. This clever product both indicates and retains as well as indicating any overheating of wheels caused by faulty brakes or bearings. Connecting two adjacent wheel nuts with our specialist polymer in our distinctive ‘S’ shape provides resistance to the loosening of wheel nuts. If the nut still manages to loosen, this will be indicated by the distortion of ‘S’ shape.