A cartridge for a machine tool is provided. The cartridge has a main body, two punch-retention arms, and two die-retention arms. Preferably, the two punch-retention arms are spaced apart and at least generally parallel to each other. Likewise, the two die-retention arms preferably are spaced apart and at least generally parallel to each other. In some cases, the main body is formed of a first metal, and the punch-retention arms and die-retention arms are formed of metal(s) different than the first metal. In one group of embodiments, the invention provides a cartridge having a weight of less than 3 pounds.