The Vise Metal Brake attaches to your bench vise (4-6in. wide jaws) and includes two 6in. dies, one male and one female. To use, just open the jaws of your vise, slip the metal between the dies, and crank the vise jaws together. The dies are precision ground and hardened stock which can easily bend 20 gauge sheet metal and 18 gauge aluminum up to a 90 degree angle. The accessory die kit contains two 1in. wide and one 3in. wide male dies for extra flexibility and precision.