This handy tool removes internal flash hole burrs. Features a tool steel cutter which is inserted into the flash hole through the case neck. Adjustable stop collar allows use with any size case. Burrs are removed with a clockwise turn. Fits .22 to .45 Calibers. If you are looking for a handy reloading tool for deburring brass casings than look no further than the Lyman Flash Hole Uniformer.