​Main Features:Made of high quality aluminium alloy with exquisite workmanship,which is smooth,lightweight,durable and wear-resistantEngineered to provide an efficient clamping action without slipping even in wet and muddy conditionsSimple and convenient design,easy and quick to installHollow lever design and rust-resistant high quality retaining boltThumb screw for accuracy & a quick release lever for ease of useIt is a little good partner for your bicycle,MTBSpecification:Material:aluminum alloyCaliber:31.8mm,34.9mm31.8mm seat post clamp is generally suitable for 27.2mm seat post34.9mm seat post clamp is generally suitable for 30.8mm-31.6mm seat postOptional color:black,red,blue,gold,silverNote:The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightnessPlease allow 1-2mm differences due to manual measurementPackage Included:1xSeat post clamp NO Retail Box.Packed Safely in Bubble Bag.