Thule Caprock Crossbar Kit - Crossbar kit allows you to easily attach the Thule Caprock roof platform to existing crossbar systems. Features Easily attach your Thule Caprock roof platform to your factory rack or other third-party rack systems. Fits crossbars up to 3.74in / 95 mm wide and between .67in / 17mm and 1.81in / 46mm tall. Crossbar kit includes four mounting points for a secure attachment. Locks are included to secure your roof platform to your vehicle's crossbars.