The Jobu Design QRR-138 Quick Release Clamp is a 2" wide replacement clamp that is compatible with all Arca Swiss-type plates and mounts. It features one countersunk hole that will work with a 3/8" male centered mounting bolt found atop a ballhead or head mounting plate.
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This clamp IS compatible with arca-swiss plates & L-brackets from RRS and Wimberley. It is well made and designed to clamp solid and tight. Since I use this on my monopod, I didn't need to spend the extra money for a quick release system. One cannot beat the price-point for this clamp! I just made reservations for another slot canyon photo shoot and I was notified that tripods are not allowed monopods only. I'll be buying an additional QRR-138 for the other photographer on the trip.
Works like its suppose to. Purchased for monopod.