Features1Made of aluminum alloy and plastic, lightweight and durable. 2CNC sand blasting finish. 3Adjustable installation angles. 4Fits for 30.9-33.9mm seatpost. 5Suitable for mountain bikes and folding bikes.SpecificationThis adpater offers a great platform for installing your water bottle cage on the bike. It is lightweight, and durable, great for mountain bikes and folding bikes.Features:Made of aluminum alloy and plastic, lightweight and durable.CNC sand blasting finish.Adjustable installation angles.Fits for 30.9-33.9mm seatpost.Suitable for mountain bikes and folding bikes.Specifications:Material: Aluminum & PlasticSuitable for 30.6 - 33.9mm seatpostWeight: Approx. 38g / 1.3ozPackage Size: 13 * 9.5 * 1cm / 5.1 * 3.7 * 0.4inPackage Weight: 48g / 1.7ozPackage List:1 * Clamp with Adapter2 * M3x15mm Bolt3 * M3x 10.5mm Bolt1 * Transparent SpacerPackage List1 * Clamp with Adapter2 * M3x15mm Bolt3 * M3x 10.5mm Bolt1 * Transparent Spacer