NIUNIU Bike Stem Extender, Bicycle Handlebar Riser Adapter, Aluminum Alloy Head-Up Adapter, Compatible with Mountain Bike, Road Bike, MTB - MATERIALS: Forged aluminum alloy material, sturdy, corrosion-resistant, rust-free, high toughness, no deformation, durable for enhanced safety during use - ADJUSTABLE: The height of the extender can be adjusted by changing the number and type of spacers, effectively reducing waist pressure and promoting a more relaxed riding posture. Helps relieve discomfort in the upper back, neck, and wrists - ADJUSTABLE HEIGHT: Allows users to freely adjust the stem riser to suit their height, improving riding comfort - Color: Red - Size: Length 12 cm, width approximately 3.5 cm, compatible with standard 28.6 mm handlebar diameter; fits most mountain bikes and road bikes - Package Includes: 1 x stem extender body, 1 x 115 mm threaded rod, 4 x 10 mm washers, 1 x 5 mm washer, 1 x stem cap Note: - Due to variations in measuring methods, there may be a 1–3 cm deviation in dimensions; please confirm acceptable tolerance before purchase - Product color may vary slightly due to differences in monitor displays and lighting conditions - Package includes only the items listed above; other accessories are not included