**Extension only. Base mount sold separately. 

With this item you can turn your regular pack mount into a multiple pack mount! Made of anodized aluminum and used in conjunction with a pack mount.This unique design adds strength and provides extra tightening power. They use a 5/16" steel all-thread rod with a steel threaded insert (Helicoil) in the base. These are not cheap injection molded plastic parts that will fail when you are 25 miles down the trail!