The ExactaRoll Double-Pin Roll Crimper by was designed for a military client and worked so well they offered it for sale to the public. This 12 gauge roll crimper has two resistance rollers that make it one of the most efficient roll crimpers designed. The double-pin design allows the hand loader greater control over the crimp allowing them to create a tighter seal and make roll crimps in less time. Notes: Must be used in conjunction with an electric drill (not include)Reloaders must put an overshot wad over the shot column before the roll crimp is applied or there will be nothing to keeping the shot in the wad