17mm Ball Head to 1/4 hole：. D. Three year warranty and free maintenance.
17mm Ball Head with 1/4"-20 Internal Threads For Gopro Insta360 Action Camera
17mm Aluminum Ball Head with 1/4"20 Threads For Gopro Hero/Insta360 Tripod Mount
Ball Head with 1/4"20 Threads 17mm Aluminum For Gopro Hero/Insta360 Tripod Mount
1/4 Screw To 17MM Ball Head Interface Plastic Joint Adapter For Phone Camera
