This bottle holder can hold two bottles, fit for long time riding or long distance travel.

Features:
Mounts up to two water bottle cages.
Fits standard saddle rail (not compatible with i-beam type).
Install to back of bike seat.

Specifications:
Material: Aluminum alloy
Color: Black / Blue / Red / Silver / Golden (optional)
Size: 10 * 12 * 7.5cm / 3.9 * 4.7 * 3in L * W * H
Total weight: 135g / 4.75oz

Package List:
1 * Water Bottle Holder Shelf
1 * Wrapped Board
2 * Washer
6 * Screw

Note:
Water bottles and bottle cages are NOT include."