Vertical Surface J-Hook Buckle Mount Adapter for GoPro Hero 2 3 3+ 4 Camera (5pcs) Fits all Gopro Hero 4, 3 and 3+ Model Made of 100% CNC machined aluminum Allows you to use other any 37mm ND, Porlized, Colored, Close up filter and lens Package includes 37mm Adapter + UV filter + Cap Aluminum material(lightweight), Black anodise(Durable), CNC cutting(Precision)