The Quad Lock Bike Mount is the lightest, strongest and most secure smartphone bike mount in the world. SECURE MOUNTING The patented dual-stage lock is strong enough to lift up to 150 pounds (yep, we tested it!). So you can ride with confidence over bumps and jumps knowing that your iPhone, Galaxy or other smartphone isnt going anywhere your bike isnt. QUICK TO ATTACH / DETACH Simply twist and lock to view apps while you ride such as Strava, MapMyRide or Apple maps. Detach just as easily so you dont miss a photo opportunity or important phone call again. Remember, its all in the technique, not the force. SLEEK DESIGN The Quad Lock Bike Mount fits tube diameters ranging from 25-40mm in diameter. What #39;s Included: 1 x Quad Lock Bike Mount Mounting Hardware 2 x Small EPDM mounting o-rings 2 x Large EPDM mounting o-rings 2 x Nylon zip ties - Glass filled nylon / polycarbonate construction - Stainless steel fasteners - 23.3mm tall - 35.5mm wide - 50mm long - Compatible with all Quad Lock cases and Universal Adaptors