Features: Bicycles stem top specially for bicycles front fork headset, well decorative your bikes. Various Types & Universal Size: The headset top comes with 20 optional types measure diameter of 31.8mm, please choose the correspondingly cap and matchs for you bicycles size Made of qualified aluminium alloy material, with strong & durable designs, exquisite technology, wear resistance, accurate hole size to improve using experience. Easy to install and fixed tightly, alloy lightweight designs to ensure riding smooth and reduce the wind resistance. Our stem top kits are suitable for most mountain bikes, road bikes, children bikes and etc, easy use and assembly for hobbyist. Specifications: Material: Aluminum Alloy Size: As picture shows Type: 1/2/3/4/5/6/7/8/9/10/11/12/13/14/15/16/17/18/19/20/21/22/23(1~20 is Bike Stem Top, 21~23 is Screw) Package Includes: 1x Bike Stem Top note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to difference between different monitors, the picture may not reflect the actual color of the item.