The 12 series is manufactured by Di-Acro, and is a hand-operated slip roller that has a cam-actuated idler roll which enables he user to spot bends at all points along a sheet of material with straight sections on both ends. The idler roll always returns to its present location, enabling duplication with optimum precision. It also has calibrated rear roll indicators which allows the user to rapidly configure the equipment when shifting from one rolling size to another.
The 12 series has the capacity to produce tiny circles with the same diameter as the forming rolls in just one operation. In order to produce either round, flat, and square materials, the bending rolls are grooved to fit the shape of the material.