This Adjustable Bike Bottle Holder can hold your water bottles very securely and firmly in place,even over rough ground.<br/>Features:<br />Aluminum alloy frame and plastic back plate,lightweight and durable to use.<br />Adjustable design is compatible with different bottles.<br />Just turn the screw to adjust the size of diameter between 60mm to 82mm.( 3.1 to 3.5inch).<br />Fits for various types of bikes such as mountain bikes,road bikes,etc.<br />Easily hold your cycling accessories,like water bottles,tool bag,etc.<br/>Specification:<br />Material: Aluminum alloy &#43; Plastic<br />Size: 170 * 60 mm / 6.7 * 3.1 in<br />Weight: approx. 50 g / 1.8 oz<br/>Package List:<br />1* Adjustable Bike Bottle Holder<br/>NOTE: Please make sure that there are any screws(not included) on your bicycle frame that can be screwed down to install this water bottle shelf.