The X-Flex Multi-Mount With Iso-Blox is a practical and versatile solution for Spray Master Classic Fenders. This package set includes four Iso-Blox, four metal caps, fender to block hardware, and mounting tube to blocks hardware. Designed to fit most makes and models, it can be used with any 1-7/8 inch mounting. The primary application is as a center mount, minimizing "spider web" cracking and eliminating direct metal to metal contact. By creating a "free floating" zone of vibration isolation, this product ensures durability and longevity for your fenders.