Madrax U Racks on Rails provide cost-effective, secure bicycle parking to apartments, retail outlets, offices, and more. This is a simple yet ideal selection where appearance, security, and value are the most important traits. This rack allows the use of "U"- type locks and provides two-point contact when a bike is resting against it. The rail-mounted options come with 2" 'C' channel rails that are always galvanized. These rails allow the unit to remain freestanding or be secured to concrete.