Joes LR Birdcage comes with a Zerk fitting that allows you to keep up on lubrication for friction free results. Top quality hardware needed provided, so you can bolt our birdcage on right out of the package. Championship proven 5½” center to center gives you the forward bite you need with maximum drive off the rear tires. Double Bearing LR Birdcages for 1¾” axles. Additional insert required for most applications.