I became familiar with Slick Locks as an employee for a company that had them on their service vans, now that I have my own company I have purchased and installed a Slick Lock kit on my company van(s). In my opinion, using just the door locks on a work van isn't enough to keep thieves out. This provides a second layer of security for the doors, and all locks are keyed the same, with two keys per lock (Heavy Duty keys). I found installation to be very simple and Slick Locks have install videos to use as well. We lost our hardware kit for rear brackets and upon contacting the company they rapidly assisted with getting the replacement bolts to us for a small shipping charge. Top notch customer service from a small American company that has a large footprint for their excellent, problem solving product. Fellow contractors, these are a no-brainer for your work\service vans!