1、The hole diameter of the connecting front fork is 28.6mm, and the outer diameter of the tube on the front fork is required to be 28.6mm. Generally, bicycles are of this size, which shall be subject to actual measurement. 2、The hole of handlebar lock is 38mm, and the middle outer diameter of handlebar is required to be 38mm. 3、Length is 110 mm, by adjusting the angle, you can change the height, there is always a suitable height for you. 4、Made of high quality aluminium alloy material, sturdy, durable and long service life. 5、Professional manufacturing, stable characteristics and high reliability. 1 x Adjustable Bicycle Stem Extender Condition: 100% Brand NewItem Type: Adjustable Bicycle Stem ExtenderMaterial: Aluminium AlloyColor: As Pictures ShownQuantity: 1PCSWeight: Approx. 414gOptional Size: Approx. 25.4x110mm/1x 4.33inch, 31.8x110mm/ 1.25x 4.33inchLength: Approx. 110mm/ 4.33inchRise: Approx. 15mm/ 0.59inch