The MCR Powder Adapter is the perfect accessory for reloaders who are using the MCR bullet meplat uniforming tool and would like to increase their efficiency. The adapter is made from 303 stainless steel and features a 1/4" hex adapter to fit in a power screw driving helping to reduce hand a wrist fatigue that comes with using the Meplat uniforming tool by hand. Notes: The adapter will accommodate either the endmill or the center deburring tool. MCR only recommends using the adapter with the endmill. Opening: .375"