The Forster Primer Pocket Chamfering Tool is made from steel and designed to last. With this tool, someone who enjoys reloading can chamfer thousands of cases with complete consistency. In addition, uniformity and depth are controlled simply by setting the stop collar. To use this chamfering tool, the case mouth is held over the primer pocket center and the crimp removed by turning the trimmer handle, all without using collets. You will see consistent ignition, as well as less occurrence of misfires, since primer and powder residue from the case pockets will be eliminated.