The 17mm ball mount for connection to any 17mm double socket arms and mounts. The 17mm ball mount for gopro is made of high quality aluminum alloy, sturdy and durable. The ball base male 1/4"-20 threaded steel stud will connect to any standard female thread found on digital cameras, camcorders, and other devices. This 17mm Ball for Insta360 ACE Pro One X5 X4 X3 X2 X R RS Go 2 3 accessories, Compatible with GoPro HERO 3+ 4 5 6 7 White Silver 8 9 10 11 12 Black HERO Max Fusion Session, DJI Osmo Action 4 3 2 and XiaoYi etc. Package Includes: 17mm Ball mount universal adapters x 1, Long Screw x 1, Adapters for gopro x 1. 17mm Ball Mount Adapter for Insta360 ACE Pro One X5 X4 X3 X2 X R RS GO 3 2, GoPro Hero, Compatible with 17mm Double Socket Arm Connects