Kupo aluminum universal smartphone holder offers the best phone holders for attaching your phone to a tripod, hand grip, or gopro style mount. Features one 1/4“ female threads at the bottom and the other on the back of the clamp for mounting your phone onto various supporting gears for portrait mode (vertical) or landscape mode (horizontal). A gopro mounting attachment is included for connecting your phone easily to any gopro equipment. Also compatible with any phone size from 2.3” to 3.55” (58mm - 90mm). The spring locking mechanism with 3 aluminum bolts and ergonomic thumb screw offers the most secure mounting solution. Soft protective rubber equipped to protect your phone from slipping and scratching.