Thule 544 One Key Lock Cylinders 4-Pack is a set of lock cylinders designed for securing Thule racks. The set includes four cylinders and keys, and it is compatible with Thule racks for skis, snowboards, and bikes. The lock cylinders are silver in color and were manufactured in China. This particular set is a vintage 1998 model and is considered new, although it may have some minor cosmetic imperfections due to its age.