The Roller Extension Bracket Kit (RREBK) is used to attach the Rhino-Rack Alloy Rollers to a Rhino-Rack Heavy Duty bar. Unlike the original kit, the extension kit enables a roller to be placed approx. 100mm (4") further out from the crossbar. The kit consists of 2 metal brackets and hardware. The brackets are powder coated black so it won't rust or fade.