Quad Lock Stem / Handlebar Bike Mount The Lightest, Strongest and Most Secure Smartphone Bike Mount Patented dual-stage locking mechanism ensures your phone is held securely to your bike Ideal for tracking your ride via apps like Strava, navigating your route via GPS, and never missing a phone call or text again Bike Mount Pro mounts to Stem or Handlebars with tube diameter from 25-40mm Compatible with all Quad Lock Cases & Adaptors 1x Quad Lock Stem / Handlebar Bike Mount Mounting Hardware <ul class="a-unordered-list a-vertical"> 4x EPDM O-Rings 2x Zipties Glass filled nylon / polycarb construction &amp; stainless steel fasteners 23mm tall and 35mm wide Suits stem / handlebars 25-40mm diameter Patented dual-stage, spring-loaded locking mechanism Compatible with all Quad Lock Cases and Universal Adapters