Specifications: This bike bottle cage adapter has silicone pad, which can well protect your bike from scratch.With the adoption of silicone pad, this bike bottle cage adapter can well protect your bike from scratch.This bike bottle cage adapter can well protect your bike from scratch with its silicone pad.Features: This bike bottle cage adapter is ultralight and integrally-molded, which is easy and convenient to install.This ultralight and integrally-molded bike bottle cage adapter is easy and convenient to install.This bike bottle holder adapter is compatible with most types of bicycles.Single: 7.8cm x 7.4cm/3.07" x 2.91" (Approx.) Installation Tube: 2cm-3.4cm/0.79"-1.34" (Approx.) Double: 8.3cm x 7.8cm x 4.9cm/3.27" x 3.07" x 1.93" (Approx.) Installation Tube: 2cm-3.4cm/0.79"-1.34" (Approx.) notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.Package Includes: 1 x Bottle Cage Adapter