Atlas mx neck brace rear mountsatlas the modern definition of extreme sports protection providing the safety mobility comfort needed to perform your bestkeep your atlas neck brace well maintained with genuine atlas spare parts features fine tune the fitment of your atlas brace by using a different offset rear mount kit exists in 4 sizes 2mm smallest 0mm 3mm and 8mm biggest for a custom fit each mount kit comes with 2 of the same size mounts a great way to extend the life of