• Material : Seat Clamp : Aluminum alloy . Lightweight, sturdy and durable ; Seatpost Ring Dust Cover : Silicone
• Package includes: 1 x Seatpost Clamp , 1 x Seatpost Ring Dust Cover. With help of the ring dust cover, it can protect the bike seat post from water, mud, sand or dust after long-distance riding
• Quick Release Design : Featuring a quick-release design, our bike seat clamp allows for easy and convenient adjustment of the seat height without tools
• Compatible size : The size 28.6mm, 31.8mm, 34.9mm refer to the seat post tube outer diameter not the seat post . 28.6 mm clamp suits for frame seat tube 27.8mm-28.8mm. 31.8 mm clamp suits for Frame Seat Tube 30.2mm-32.1mm. 34.9 mm clamp suits for Frame Seat Tube 33.5mm-35.2mm
• Before purchasing a seatpost clamp, you need to measure the SEAT TUBE O.D of the frame and then select the appropriate seatpost clamp