4 Pack Lock Cores One Key System Replacement Lock Cylinders for Car Roof Racks Components [Compatibility] Our lock cylinder kit is fit for Roof Racks with lock cores, enhancing security for your cargo. Safeguard bikes, surfboards, canoes, kayaks, ski and snowboard racks, and more with ease. [Easy Installation] Remove the lock cylinder, insert it into the bottom of the lock, press against the upper cylinder of the lock cylinder, and then remove the key. Colour:Black & Silver Material:Aluminum alloy + stainless steel Package Contents: 1 * Lock Cores and Key set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.