The MEC Shell Checker is a convenient part to have on hand. Used by novice and seasoned reloaders alike, this tool ensures that reloaded shells have the ability to chamfer properly. This checker has precision machined holes, which are clearly labeled either GO or NO GO when testing both roundness and size. The shell checker is made from durable stainless steel and is designed to handle 10, 12, 16, 20, and 28 gauges, as well as .410 Bore. The shell checker is affordably priced, and in order to bear the MEC name, it must pass strict quality-control checks.