This retainer can be used on wheels, machinery and any equipment that has safety critical nuts. It comprises of two coils, which when pushed together widen to sit around two adjacent nuts. Releasing the Checklock SQ allows the coils to tighten and limit the nuts from loosening. The Checklock SQ is manufactured using high quality stainless spring steel which is then heat treated to fix the retaining function and enabling it to be continuously reused. The Checklock SQ is designed to be used on wheels without trims and step rings. This product can also be combined with a Checkpoint to provide a more visual appearance and overheating indication. It provides a clear commitment to health and safety, and roadworthiness to other road users, and road and transportation associations such as: DfT, FORS, DVSA, HSE, FTA and RHA.