Bike type:Mountain Bike Material type:Aluminium Batteries included?:No Product Dimensions:2.5 x 3 x 6 cm; 13 Grams Features:- Made of full CNC precision machining aluminum alloy, anti-slip, light weight and durable.- Easy to install and remove, convenient for you to use.- With this seat post tube adapter, you can change the bicycle seat tube to the size you want.- Suitable for MTB bike, mountain bike, road bike, etc.- Please check the outer diameter of your bicycle seat tube. Measure the inner diameter of the old clamp. Or measure the outside diameter of the seat tube. Then make the right choice.Specification:Condition: 100% NewMaterial: Aluminum AlloyColor: blackOptions: 27.2mm to 28.6mm, 27.2mm to 30mm, 27.2mm to 30.4mm, 27.2mm to 30.8mm, 27.2mm to 31.6mm, 27.2mm to 33.9mmSize/ Length/ Weight27.2mm to 28.6mm/60mm/2.36inch/13g27.2mm to 30mm/60mm/2.36inch/22g27.2mm to 30.4mm/60mm/2.36inch/29g27.2mm to 30.8mm/60mm/2.36inch/25g27.2mm to 31.6mm/60mm/2.36inch/37g27.2mm to 33.9mm/60mm/2.36inch/54gPackage list:1 * Bike Seatpost Tube Adapter About this item [High Quality]: Made of full CNC precision machining aluminum alloy, anti-slip, light weight and durable [Easy to Install and Remove]: The seatpost tube adapter is easy to install and remove, convenient for you to use [6 Different Size]: The bike tube adapter has 6 size, you can choose the bicycle seat tube size according to your need [Wild Range of Application]: This product is used with most bicycles, for example MTB bike, mountain bike, road bike, etc. [Warm Note]: Please check the outer diameter of your bicycle seat tube; Measure the inner diameter of the old clamp; Or measure the outside diameter of the seat tube. Then make the right choice [High Quality]: Made of full CNC precision machining aluminum alloy, anti-slip, light weight and durable [Easy to Install and Remove]: The seatpost tube adapter is easy to install and remove, convenient for you to use [6 Different Size]: The bike tube adapter has 6 size, you can choose the bicycle seat tube size according to your need [Wild Range of Application]: This product is used with most bicycles, for example MTB bike, mountain bike, road bike, etc. [Warm Note]: Please check the outer diameter of your bicycle seat tube; Measure the inner diameter of the old clamp; Or measure the outside diameter of the seat tube. Then make the right choice