This is a 10 3/4 in. left handed dual arm operator with a 4 1/16 in. offset link arm. The long, continuous arm and jointed arm create an action that pushes the sash open while pulling the hinge side of the sash to the open position. It is made of heavy duty diecast zinc and protected with the corrosive resistant E-Gard coating process. This is the arm operator only, the operator base and crank handle are not included.