4 Pack Lock Cores One Key System Replacement Lock Cylinders for Car Roof Racks Components [Compatibility] Our lock cylinder kit is compatible with roof racks that have 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. Color: Black & Silver Material: Aluminum alloy + stainless steel Package Contents: 1 x Lock Cores and Key set Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.