Buy from Amazon.com : http://fave.co/1bEjUdZ

Fotodiox Pro WonderPana Go with 58mm Step-Up Ring Kit - GoTough Filter Adapter System for GoPro

Product Description :
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