Rokform [Galaxy S3] Pro-Series Adjustable Aluminum Bike Mount / Holder & Protective Phone Case, Twist Lock & Magnetic Security KEEPS YOUR PHONE SECURE: Utilizes the innovative Roklock quarter turn system & Roksafe magnetic technology to keep your iPhone safe & secure during the roughest trail or road rides ADJUSTABLE VIEWING ANGLE: Tilts from -20 to +55 degrees so you can view and access your phone while you ride. Great for listening to tunes, screening texts & calls, using GPS or STRAVA MILITARY GRADE: Constructed of durable 6061 T-6 aircraft grade aluminum with a stainless steel screw to stand up to daily use and abuseyet it's surprisingly lightweight Made in the USA: This is not some cheap overseas import! Our sturdy iPhone bike mount system is proudly designed, engineered & manufactured in Orange County, California USED by CHAMPION CYCLISTS: Used and endorsed by pros like Johnny OMaraa Motocross/Super cross Champion and master Cross Country Mountain Biking Champion