In addressing conduit bending, the NEC requires that "bends in conduits will be made so that the tubing will not be injured and that the internal diameter of the conduit will not be effectively reduced." The Chicago-Type manual benders accomplish this quickly and reliably. It consists of a carriage to provide firm support, a removable bending frame so the user can work off the carriage or workbench, a 0 to 90degree bending indicator, a short handle and a shoe to accommodate specific conduit sizes. The user puts a piece of rigid pipe into the short handle to gain greater leverage. Shoes come in sizes from 1" to 2".