3 Way Pivot Arm Extension Link Helmet Mount and Thumb Screw For GoPro Hero 3 3 Plus 4 Feature:
This arm extension smooth filming angle settings ，functions can connect with related accessories， such as waterproof case， also can install to the bicycle.
Specification: Color: Black
Material: Plastic + Aluminum
Fit for: GoPro Hero 2， 3， 3+， 4

Package included:
2 x Straight Extension Link (Short + Long)
1 x Thumb Screw Detail pictures: