Description: 【Adjustable base】There is a fixed screw adjustment knob at the bottom of this kettle rack, which can be adjusted by hand or Allen wrench. The advantage of adjustment is that the tension can be controlled by itself to adapt to different sizes of kettles.  【Durable quality】 The bottle cage is made of high-quality Aluminum Alloy, strong and durable, lightweight, easy to install. Very suitable for roads, mountains, electric bicycles, adults, kids bicycles, motorcycles. 【No bottle fall off】The Water Bottle does not fall when it is bumpy: there is a a fixed screw adjustment knob at the bottom of this kettle rack to adapt to different sizes of water cups, so you don't have to worry about the small water cup falling or shaking during riding. 【Professional Design】: The bottle is designed to allow quickly access your water bottle or cup, keep adequate water when riding   Specifications: Color: Red Material: Plastic Aluminum Alloy Package include: 1* bike water bottle holder