The CK801 Rixen & Kaul Extender Solo Seat Post Adapter is a versatile and convenient accessory for cyclists who need to adjust the height and position of their bike seat. Here are some of its key features: -The Extender Solo Seat Post Adapter is made of high-quality aluminum alloy, which makes it strong, durable, and lightweight. -The adapter allows you to extend the height of your bike seat by up to 20cm, giving you more flexibility and comfort when cycling. -The adapter can be easily installed onto your bike's seat post using a single bolt, which is included with the product. -The adapter features a swivel mechanism that allows you to adjust the angle and position of your bike seat, making it easier to find a comfortable riding position. -The adapter is compatible with most standard bike seats, so you can use it with your existing seat or upgrade to a new one if desired. -The adapter is designed to be compatible with Rixen & Kaul's KLICKfix system, which allows you to quickly and easily attach and detach various accessories from your bike, such as bags and baskets.