This listing comes with one Chrome Rack Bar Extension Clamp.

These Chrome Rack Bar Extension Clamps allow you to connect two 1.5" diameter bars end to end to create a longer bar. These extension clamps are built tough so they can handle the load with ease, whilst blending in to the look of the rack.

Item Measurements:
Inside Diameter: 1 1/2"
Outside Diameter: 1 7/8"
Length: 3 1/8"

See what Gibraltar has to say about a variety of their clamps in the video below. At 6:47 he demonstrates the Chrome Extension Clamp specifically.

WARNING: Cancer and Reproductive Harm - https://www.P65Warnings.ca.gov