Fotodiox Pro WonderPana Go with 77mm Step-Up Ring Kit - GoTough Filter Adapter System for GoPro Hero3 Housing Case with Step Up Ring for 77mm Standard Filters Simple installation of all-metal WonderPanaGo filter adapter onto GoPro waterproof case, your case remains water tight! All-metal adapter screws onto your for a solid permanent mount - crucial in a sports camera; Kit includes special screwdriver for easy installation Adapter does not interfere with normal function of the camera or the case; Step-Up ring allows standard filters to fit the WonderPana Go filter system Precision made from premium-grade aluminum with anodized Flat Matte Black Finishing 24 Month Manufacturer Warranty