Using super heavy duty rubber, the TrailKASE is designed to conveniently fit any size phone with or without a case on your bicycle while you ride! Using an 1/8 turn (10 o’clock to 12 o’clock), the TrailKASE securely attaches to the handle bar bracket (included). By simply wrapping the rubber case around all 4 corners of your phone, your phone is secure and provides 100% visibility to your screen. Designed to fit any phone fits phones with or without protective cases clamp fits handlebar diameters 24mm to 32mm (remove inserts for 32mm) adjust bracket position for desired viewing angle mounts phone for landscape or portrait made from engineered plastic and rubber