The Quad Lock® Bike Mount is the lightest, strongest and most secure smartphone bike mount on the market. Secure Mounting: Featuring a patented dual-stage lock, you can ride with confidence over bumps and jumps knowing that your smartphone isn't going anywhere your bike isn't. Quick to Attach / Detach: Simply twist and lock to view apps such as Strava®, MapmyRide or Apple® maps as you ride. Detach just as easily so you don't miss a photo opportunity or important phone call. Sleek Design: At just 23 mm tall and 35 mm wide, the Quad Lock® Bike Mount fits seamlessly onto the stem or handlebar of your bike. Tech Specs: Suits bar sizes 25 - 40 mm in diameter. Glass filled nylon / polycarbonate construction. Stainless steel fasteners. 23.3 mm tall. 35.5 mm wide. 50 mm long.