Package Includes: 4 X Lock cylinders, 2 X unlocking keys and 1 X control keys. Safe and reliable. If you have any questions, please contact us in time and we will reply within 12 hours. Easy Installation: Package is equipped with installation instructions, which can help you complete the installation in a short time, saving time and effort. High-Quality Material: Lock cylinders is made of zinc alloy material with corrosion resistance, high stability and wear resistance, which can prevent rusting during use and prolong the service life of the product. SKS Lock Cylinder System: Core lock kit uses SKS lock cylinder locking design, which is easy to install and suitable for any position on Yakima. All lock cylinders on the frame system can be unlocked and locked by an unlocking key. Compatible with: Lock core kit is fit for Yakima frame system, locking the appropriate accessories, and it is fit for you to store items such as roof boxes, bicycles, tents, snowboards, etc. Before purchg, please confirm whether it is suitable for your rack lock core rack.