Tein Flex Z Coilover Suspension Kit - Vitz KSP90 Sytec and the inner rib is

and the inner rib is the same as the normal one to secure sufficient strength

When installing

unlike many other wheel nuts available in the market

designed for fast response and able to withstand harsh conditions

enthusiasts can reduce abnormal tire wear and significantly improve handling and overall stability

Tein Flex Z Coilover Suspension Kit - Vitz KSP90 Sytec and the inner rib isTein's flagship coilover, the Flex Z includes all the features you'd want on a suspension kit. 16 level damping adjustment, full ride height control and replacement top mounts make Flex Z the complete package. Highly durable, each Flex Z kit features thorough rust proofing and is made of high strength, highly durable steel for added peace of mind.