JINYU 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 increased 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 allowing for a more relaxed riding experience. Helps relieve discomfort in the upper back, neck, and wrists. Adjustable Height: You can freely adjust the stem riser to suit your height, enhancing riding comfort. Color: Red Size: Length 12 cm, width approximately 3.5 cm, fits standard diameter 28.6 mm, compatible with most mountain bikes and road bikes Package Includes: 1 x stem extender main body, 1 x 115 mm threaded rod, 4 x 10 mm washers, 1 x 5 mm washer, 1 x stem cap Note: 1. Due to different measuring methods, there may be a 1–3 cm deviation in dimensions. Please confirm the size is acceptable before purchasing. 2. Due to variations in monitor displays and lighting conditions, the actual color of the item may differ slightly from the image. Your understanding is appreciated. 3. Package includes only the items listed above; other products are not included.