An adaptor kit for the Thule Rapid System Grab-On Foot Set. These allow for Thule Rapid System Grab-On Foot Set to mount a Front Runner Slimline and Slimline II roof rack to the factory roof railings of many cars, wagons and SUVs. Black powder coated aluminum extrusion. Pre-machined mounting holes. Rigid and tough design. Comes in a set of (4) four.