Those apexes are uniformly put but asymmetrical in shape, with one steep edge the spring-loaded pawl grabs. Even though tightening the ratchet, the threaded strap rolls within the axle. This movement shortens and tightens the strap through the load. Basket straps encapsulate the tire for a cosy, secure tie https://carcarriersupplies.com/product-category/axel-straps/