This Louver Window Operator comes non-handed and is a rack operator with an adjustable break-off link extension arm for universal application. It is side mounted with 2-1/8 inch (54 millimeter) screw holes. The 3/32 inch (2.4 millimeter) long spindle has a 5/16 inch (7.9 millimeter) spline size. This louver window operator comes complete with crank handle.