We all know how scary it can be to install or remove valve locks with just your fingers. One slip and you're looking at one painful injury. This new tool is definitely the best we've seen for performing this delicate task. To install keepers compress valve spring, place valve locks on the magnetic stem of the tool, push body of tool over the locks and position them on the valve stem and release valve spring. To remove keepers, use the magnetic stem to pluck off the valve locks once the valve spring is compressed. We offer several sizes that cover most automotive and motorcycle applications.