Are you looking for a professional, yet affordable bike heightening device? Are you in search of a sturdy, trustworthy tool that can do multiple jobs at once? If yes, look no furtherOur professional bike heightening device must meet you needs. It is one of the best choices for you.- The material of the product is finished by the aluminum alloy turning process, which makes it have better strength.- Sturdy, corrosion-resistant, rust-free, high toughness, no deformation.- The height of the extender can be adjusted by adjusting the number and type of spacers, reducing the pressure of waist effectively, biking more relaxed. Take the discomfort away from your upper back, neck and wrist.Purpose: Installed between the stem and the front fork to increase the height of the handlebar for adjustment, especially suitable for riders who ride long distances.Delivery Quantity: 1pc,Dimensions: length 12cm; inner diameter of the lower tube (in contact with the front fork): 31MM.; outer diameter of the upper tube (matched with the stem): 28MM.Applicable models: general mountain bikes, BMX bikes, folding pad bikesColour: BlackKind tips1. Package content: only the above package content, excluding other products.2. The size is measured manually, please allow 1-2 cm measurement error3. Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.