All those apexes are uniformly put but asymmetrical in form, with a single steep edge the spring-loaded pawl grabs. Though tightening the ratchet, the threaded strap rolls round the axle. This movement shortens and tightens the strap over the load. Axle Straps are preset within the car's axle to https://carcarriersupplies.com/product-category/ratchet-tie-down-straps/