Description: - 【Premium Material】: Crafted from high strength steel, this bike seat post offers a lightweight design and durability, enhancing children cycling experience - 【Enhanced Load Bearing Design】: Featuring a thickened structure, this bicycle seat post is designed to maintain stability during rides, preventing any wobbling or loosening of the seat - 【Long Performance】: The surface is treated with anti rust coatings that resist scratches and wear, making it suitable for various outdoor environments - 【Easy Installation】: Easy installation and removal; the standard diameter ensures a high compatibility rate for upgrading or replacing your child's bike seat post - 【Universal Compatibility】: This children bike seat post is compatible most children's balance bikes, scooters, and bicycles, easy to install Specification: - Material: Steel Size Chart: 25.4mmx180mm: 2.54cmx18cm/1.00inchx7.09inch 25.4mmx200mm: 2.54cmx20cm/1.00inchx7.87inch 25.4mmx300mm: 2.54cmx30cm/1.00inchx11.81inch 27.2mmx300mm: 2.72cmx30cm/1.07inchx11.81inch 27.2mmx400mm: 2.72cmx40cm/1.07inchx15.75inch 28.6mmx300mm: 2.86cmx30cm/1.13inchx11.81inch 28.6mmx350mm: 2.86cmx35cm/1.13inchx13.78inch 28.6mmx400mm: 2.86cmx40cm/1.13inchx15.75inch 31.8mmx400mm: 3.18cmx40cm/1.25inchx15.75inch Package Includes: 1 Children Bike Seat Post Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.