Description: 【Effortlessly Upgrade Your Bike】: This fork stem quill riser adapter is the great solution for modernizing your bicycle. It allows you to convert a traditional 25.4mm (1") threaded fork to use a modern and widely available 28.6mm (1 1/8") threadless stem, opening up a world of new handlebar and stem options 【Enhance Your Riding Comfort】: Functioning as a handlebar riser, this stem riser adapter increases your stem height by approximately 155mm. This allows for more upright and ergonomic riding posture, helping to reduce discomfort on your back, neck, and wrists during longer rides 【Durability and Secure Construction】: Built to last, this bike stem riser adapter is crafted from a high strength combination of iron and aluminum alloy. This sturdy construction ensures a solid, reliable connection between your fork and new stem, giving you the confidence to tackle any road or trail 【Wide Compatibility】: Designed for versatility, this bike stem extender is an ideal fit for mountain bikes, folding bikes, 【Simple and Straightforward Installation】: Get your bike upgraded in minutes. Simply insert the 25.4mm base into your bike's head tube, tighten the expander bolt to secure it, and you're ready to clamp on your new 28.6mm threadless stem. No complex tools or procedures required Specification: Material: Aluminum and Iron Color: Silver and Black Size Chart: Length 15.5cm/6.10inch Package Includes: 1 Bike Stem Riser Adapter  Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.