Bicycle Water Bottle Extension Bracket Set (5 Piece Set). With 2 500ml Thermos Bottles And 2 Bicycle Bottle Cages (Black) [Design] A Bicycle Bottle Cage Is Designed Under The Seat. One Bottle Cage Extends Outward And Expands Two Bottle Cages, Which Saves Space And Is Convenient For Water Storage. [Material] The Bicycle Bottle Cage Is Made Of Stainless Steel, With Two Abs Bottle Cages And Two 304 Stainless Steel 500ml Thermos Bottles. [Installation] Diy Manual Installation, Very Simple. Comes With Screws And Tools [Size] Bicycle Bottle Extension Frame: 11.5*7*3cm, Bicycle Bottle Frame: 13.7*6.8*7.8cm. Bicycle Water Bottle Capacity: 500ml. Set Weight: About 600g. [After-Sales Service] This Bicycle Water Bottle Expansion Bracket Set Is Shipped Domestically. If You Usually Like To Ride A Bicycle, Then This Bicycle Water Bottle Set Is Perfect For You. We Are Very Friendly To Every Buyer And Friend. If You Have Any Questions, Please Contact Us And We Will Get Back To You Within 24 Hours.