Designed to operate by one semi-skilled operator. Capable of Cutting helical grooven on 8" to 13" dia segments at 50%, 55%, 60%, 65%, 68%, 70% angle. Fitted with 4 jaw chuck, special screw & P. B. nut for longer life. Supplied with electric motor, starter, gearbox & coolant pump. Dividing head is provided for milling 40, 50, 60, 70, 80, 95, 100, 120 & 130 nos. of helix.