Product Features: Suitable for hero1 , 2, 3, 3 + hero4 mountain dog SJ4000 5000 6000 7000. For ants need to add an adapter Used on the arm, wrist and all similar size objects Soft cushion design on the back, more comfortable to wear Can be directly connected to the waterproof shell, side opening shell use for Arm Strap Hero 4 3+ 3 Mountain Dog Ant 360 Degree Rotating Wrist Strap The arm strap is used to strap the DV to your arm for . Available in cycling (bicycle, motorcycle), paddling snow, surfing and other sports, arm wrist calf and the size of the similar can be tied, (thighs can not be tied), mountaineering wading biking and diving can be. This section by the arm strap with a connection to change the direction of , specifically designed for the need to on the wrist, suitable for underwater , skiing selfie, tied to other shelves, etc.. Can be used as a duffel bag buckle by DIY yourself. size: 13 x 7 x 3cm Material: Nylon + alloy colour: black Package Contents: 1 x palm strap 1 x screw Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Product Features: Suitable for hero1 , 2, 3, 3 + hero4 mountain dog SJ4000 5000 6000 7000. For ants need to add an adapter Used on the arm, wrist and all similar size objects Soft cushion design on the back, more comfortable to wear Can be directly connected to the waterproof shell, side opening shell use