Arkon"s AMS Series is designed exclusively for use with Trident"s Kraken A.M.S. smartphone cases. The AMS034 is a quick release zip-tie style strap mount is made to fit cylindrical posts with a diameter of 15mm -55mm. It is compatible with most straight, drop, trekking, touring, and standard 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. For even more versatility, use your strap mount at the gym on treadmills and elliptical machines and listen to music or watch streaming video during your workout.