Photo Studio Super Clamp Holder Mount with Mini Ball Tripod Head 1/4" Screw for Gopro Hero 1 2 3 3+ This Clamp is Opening up to 30mm, Rubber Coated in the end of the clip Made of Metal, Matt Coated inside out Clamp wide: 80mm, Firmly mounted Load: 500g, Ball Tripod 360 degree whirling Compatible with Gopro Hero 1 2 3 3+ 4 HD