Easy to fit to existing Thule square bars. Once engaged, the J Bars hold our 15ft tandem kayak securely. The quality of the hardware also seems good, time will tell. The folding feature comes in handy when you're not removing or removing roof rails, allowing J-rods or hooks to lie flat when not in use. Small adjustments were needed for optimal performance, but they were easy to make. And they were available, which is a big factor with Covid Times back orders for many outdoor products like kayak mounting systems or roof racks. Twist the rubber inner tube around the Thule handlebar to achieve a fully secured, wobble-free connection of these J-arms, even when the locking knobs are fully tightened. The bottom bar, which attaches the J-bars or hooks to any roof rack system, is more versatile, accommodating round, square, and aero bar shapes. I'm guessing that's why we moved before we added the inner tube rubber drumsticks around the bars. However, after adding each game was gone.
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