Reduction gear unit manufactured by involute tooling corporation, faridabad, is a worm type unit with a modular construction. It consists of hardened ground worms with centrifugally cast bronze gears. If combined with an additional helical gear unit, the resulting one can be used to give particular low output speeds. The gear unit can be supplied in the following types: one or two output shafts; foot or flange mounted; hollow input for standard iec motors; and hollow output for direct shaft mounting.