Arkon"s AMS Series is designed exclusively for use with Trident"s Kraken A.M.S. smartphone cases. The AMS032 is a handlebar mount is made to fit bicycle and motorcycle handlebars up to 33mm diameter. It is compatible with most straight, drop, trekking, touring, and standard (25.4mm and 26mm) size handlebars. This mount is also great for use on boat helms, golf carts, ATVs, snowmobiles, hang gliders, and other apparatuses with cylindrical frames or posts.