This is a bronze casement operator that has been used on wood and vinyl windows for the last 35 years. It is left handed as viewed from the inside looking out. The body is bronze diecast with a steel worm gear driving a 9-1/2 in. painted steel arm with plastic guide button on the tip. The guide button glides through the track Prime-Line part H 3530. It contains one operator, 1 crank handle and installation screws. For matching right hand operator use Prime-Line part H 3569.