ITEM NAME:Bicycle Kettle Extension Holder Water Bottle Cage Handlebar Saddle Adapter Product Description Description: Features: Applicable tube's diameter 1.5CM-4.2CM/0.59- 1.65" Suitable for folding bike, road bikes, mountain bikes Fixed base can be rotated 360 degrees + Quick disassembling design High tech materials, super toughness Fixed base can be separated from kettle rack,as a general bottle rack installed the upper and lower tube Material: Plastic + Alloy Color: Black Weight: 95g including the adapter the screws and the tool for install ! you can buy which you need ! Included: 1 X Black Bottle Cage Adapter.Fixed base can be separated from kettle rack,as a general bottle rack installed the upper and lower tube. Included: 1 X Black Bottle Cage Adapter. including the adapter the screws and the tool for install !