TOZ TZN-S03 Universal Rotary Extension Arm Mount Set for Gopro Hero 4 3 3+ 2 1, GoPro Accessories Kit Extension Arm Adapter Pivot Arm Thumbscrew Made of PC plastic material, more durable. Easy to install Compatible with Gopro Hero 4/ 3+/ 3/ 2/ 1, and accessories mounts. Come with rotary pivot arm, you can make different combinations and get more shooting angles.