Wiseup 3x CNC Aluminum Stainless Thumb Knob Bolt Nut Screw for GoPro Hero 4 3 Plus 3 2 1 Made of CNC Aluminum Compatible for GoPro Hero 4 3 + 3 2 1 One set include 1 long & 2 short screw Help you to easily tighten and loosen screws between Gopro mount and camera The long screw in the pack is for use directly underneath your camera casing so that there is enough length for you to easily access the screw head, The shorter screws are made to attach base or extension mounts