Strauss Cycle Mobile Phone Holder with Mount Bracket (Black) and Mobile Holder (Black) Material: Other In-box Contents: 1 Double clamps with silicone mats to hold your phones or other devices and protect your devices An adjustable clamp design on the pedestal, convenient installation onto different bikes. (Supports those handlebars, the diameters of which are between 15mm and 30mm.) Wide compatibility: Bike phone mount bracket stand cradle support for nearly all mobile cell phone