Feature:Easy to install. Made of aluminum alloy, Durable materials for long time service.Suitable for most of mountain bikes, road bike, MTB etc.There is a safe line mark on the seat post. Please insert at least above the minimum safety line.Specification:Material: Aluminum AlloyColor: Black Thickness: 2.5mm / 0.1"Dimension: 450x25.4mm / 17.72"x1.00"(L*D)Hole 1 Size: 25.4x20.7mm / 1.00"x0.81"(OD*ID)Hole 2 Size: 22.2x17.2mm / 0.87"x0.68"(OD*ID)Note: The size measured by hand, so it may have a little 1-2 mm difference. Note: Please do measure the outer diameter then choose the actual required diameter or measure the inner diameter of the frame tube before purchasing.Package Included:1 x Bicycle Seat Post.
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