The Standard CV Joint Boot features a bellows/accordion style rubber boot which enables the product to be extremely flexible whilst feature excellent durability.Two sizes available:    CV Boot ONLY: Total Inside Diameter: 107 mm, Bolt Hole PCD: 94 mm, Boot Diameter: 25 mm, Bolt Hole Diameter: 10.2 mm    CV Boot KIT (inc bolts, grease and clips): Total Inside Diameter: 94 mm, Bolt Hole PCD: 78 mm, Boot Diameter: 22 mm, Bolt Hole Diameter: 8.2 mmThe CV boots are manufactured from a mix of coated steel and convoluted rubber, each manufactured for maximum longevity and increased flexibility. The CV Joint Boot protect the CV joints themselves by creating an optimum seal around the joint maintaining overall lubrication. This in turn reduces the impact of damp and debris affecting the joint, vital for competition situations where vehicles are subject to increased stresses and varying extremes of environments.