This Prime-Line H 3571 Right-Hand Casement Operator features a guide button that easily glides through the track. This casement window handle is used by a variety of wood and vinyl window manufacturers. Designed for right-handed casement windows. It is right-handed as viewed from the inside looking out. The body of the window handle crank is constructed of bronze diecast, with a steel arm and worm gear. The arm of the casement window crank handle replacement measures from the middle of the guide button to the middle of the crank operator while closed. For further dimensional information, please see the line drawing (not universal).