The YakAttack RotoGrip Phone Holder Pro is exactly the phone holder you would expect from YakAttack. Its revolutionary design is unlike anything that exists on the market and utilizes our popular RotoGrip technology allowing for quick one-handed operation. The phone holder features two adjustable rubber wheels that securely holds most modern-day smartphones and the width settings can easily be adjusted. Compatible with smartphones ranging from: 2.75” to 3.625” wide, 0.303” to 0.625” in thickness.