Aluminum Alloy CNC machined aluminium alloy, heated treated for a strong and lightweight design,will not attrit the bicycle frame and easy to install.Powder coated finish and high tumble polished to match your shiny bike paintwork.Easy to Install Bike bottle cage is easy to install and comes with 2 screws per bottle cage that will give it a firm hold against the threaded holes on your bike's frame. the screws are standard size for water bottle mounts to most of bikes with drilled holes, and washers are suggested for tight fixing.Hold Tight water bottle holder for bike has a secure hold,The 360-degree surround design ensures that your kettle will not fall off even on rugged roads ,Stay hydrated on your Ride. Great for road, mountain, hybrid, touring and electric bicycles.Fits Most Standard Size Water Bottles This Water Bottle Cages are made to fit any water bottle in standard size.