Old style dual arm action pushes the sash open while pulling the hinge side of the sash to the open position. When properly installed this operator results in almost effortless operation of both casement and awning type windows of many sizes and weights. NOTE: IF COLOR IS SELECTED in Drop Down Menu - your operator will be shipped complete with a sill stop face gearbox (1) COVER AND (1) CRANK HANDLE UNIT, and STUD BRACKET AND SCREWS.