Made of solid aluminum and powdercoated black, the Bike Mount can attach to the Rack Crossbar or TracRac Base Rail depending on which system you have. The bike mount slides to any position along the width of the crossbar or the length of the base rail, allowing the user to position their bicycle virtually anywhere on their system for maximum cargo flexibility. Features: The bike mount is made out of aluminum and features a heavy duty locking knob for add security and comfort. The Kit Includes: Qty:1 - Bike Mount Bracket Qty:1 - Locking Quick Release Bike Skewer Qty:1 - 1/2"-13 TracKnob Qty:2 - 3/8"-16 SS T-Bolt Qty:2 - 3/8"-16 Three Prong Knob Qty:2 - .38 x .75 Spring Washer Dimensions: 7.75 / 5 / 3.5 (in) Weight: 2lb