Features:1. Made of aluminum alloy, heat-treated for a strong and lightweight design. With an anodized finish and high tumble polished to match your shiny bike paintwork. 2. Compatible with almost all types of bicycles. Buy this bottle cage to stay hydrated for those extra long rides, so you can go the distance!3. The secure and sturdy bottle retention system ensures a full bottle stays firmly in place when riding, whether you're out riding fast on roads or bumpy trails.4. It is easy for you to install the bottle holder in the right place. This bike cup holder can be installed on the bike handlebar, under-seat, down tube, fork, and front pipe.5. The water bottle cage can be rotated 360° for easy fetching the water bottle. It can hold different cups, cans, and bottles. Specification:Model: A Type - Double Bottle Cage ConverterWeight: about 85GMaterial: 6061 aluminum alloySize: about 8.2x5x7.8cm/3.23*1.97*3.07inApplicable: Φ21-31.8mm/0.83-1.25in diameterModel: B type - single bottle cage converterWeight: about 50GMaterial: 6061 aluminum alloySize: about 7.3x7.3x7.8cm/2.87*2.87*3.07inApplicable: Φ21-31.8mm/0.83-1.25in diameterPacking List:Bicycle bottle cage converter*1Notes:1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color which is shown in the pictures.2. Please forgive a slight measuring deviation due to manual measurement.