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The ball size is 20mm and is compatible with any of our standard Carbon Fiber + Kevlar Mounting Arms with 20mm connector ends and our GoPro Mount. The 2 holes are positioned 47mm apart.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.