1 pc. Stem Riser Extender Bike Handlebar Mountain Adapter 55 MM Description: Hidden stem enhancer, frame head extender. Effectively reduce pressure on the waist, making driving easier and more comfortable Suitable for front fork stem with external diameter of 28.6mm/1.13inch, the inner diameter of the front fork must be more than 23mm/0.91inch Made of high strength aluminum alloy, lightweight, corrosion resistant, rust free, high strength, not easy to deform Easy to install, simply attach the bicycle fork bracket to make it beautiful Ideal for mountain bikes, road bikes, MTB and more. Specification: Black color Material: aluminum alloy; Size (L. x H ): approx. 30mm extension: 28.5x80mm/1.12x3.15 inch 55mm extension: 28.5x105mm/1.12x4.13 inch The package includes: 1 piece fork stem extender Note: 1. 2. Due to the difference between different monitors, the image may not reflect the actual color of the item. 3.