Description: Using high-quality aluminum alloy material and heat treatment process, high hardness, wear resistance and durability. Small size, light weight, easy to install and use. Featuring easy installation, our product can be operated effortlessly. And it looks stylish and beautiful due to the smooth texture and vibrant color. It is made from aluminum alloy, is durable to use. There are two sizes of the product to choose from. Suitable for mountain bikes and road bikes. The 31.8MM is suitable for 27.2/28.6MM seat post, and the 34.9MM is suitable for 30.9/31.6MM seat post. Item Name: Bike Seat Post Clamp Material: Aluminum Alloy Features: In-deformable, Ultra-light, Multi-functional Size Details: Collar Diameter: 31.8mm/1.25" (Approx.) Collar Diameter: 34.9mm/1.37" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Bike Seat Post Clamp Using high-quality aluminum alloy material and heat treatment process, high hardness, wear resistance and durability. Small size, light weight, easy to install and use. Featuring easy installation, our product can be operated effortlessly. And it looks stylish and beautiful due to the smooth texture and vibrant color. It is made from aluminum alloy, is durable to use.