A car door lock kit contains all the necessary parts and tools for the correct installation or replacement of a lock on a vehicle’s door. Usually, it contains the complete lock mechanism along with all needed brackets, bolts, knobs, and sometimes keys or key cylinders. In addition, some other parts like wiring harnesses pertaining to electronic door locks are sometimes provided as well. The kits are designed provide an entire solution for do it yourself (DIY) mechanics that are easy to install. Whether it is replacing the broken lock or changing to a better system, a car door lock kit guarantees that all the components that come will be compatible.