With the Thule® Locking Bed Rider Add-On Block, you can carry an additional bike. It fits the Thule® Thule Bed Rider Rack, and allows you to carry a total of 3 bikes. FEATURES: Add-on for the Thule® Thule Bed Rider Rack Increases bike capacity from 2 to 3 Features a 9 mm lockable quick-release fork-mount skewer Locking skewer connects bike to rack Bikes can be locked to the rack and the rack can be locked to the truck Dimensions: 4.5” x 8.5” x 4” Weight: 1.8 lbs. Manufacturer’s Limited Lifetime Warranty