DescriptionMaterial : Aluminum/AlloyModel Number : Seat Post ClampSize : 28.6 31.8 34.9 mm outer diameterUse : Mountain BikesBrand Name : HiMISSOrigin : Mainland ChinaColor : black, redDescription:Weight: about 38 grams ~ 40.5 gramsColor: black, redProcess: Aluminum alloy materialWell-madeSpecification: 28.6 31.8 34.9 mm outer diameter.Seat tube clamp with a diameter of 28.6mm, suitable for 25.4 outer diameter seat posts31.8mm diameter seat tube clamp, suitable for 27.2/28.6 outside diameter seat post(Part of the fixed gear 27.2 seat post uses a 29.4mm seat tube clamp, please confirm by "actual measurement")34.9mm diameter seat tube clamp, suitable for 30. 4/30.9/31.6 outer diameter seat post(The diameter of the seat tube will be marked under most of the seat tube, and you can see it when you pull out the pole)Packing list:1 * Seatpost ClampNote: Due to different personal displays, light and contrast differences, there may be slight color difference between the picture and the real object.