Used on old style, steel-framed crank-out casement windows This is a left-handed operator. Handing is determined when facing the window from the inside looking out. Like the hinges, this operator will also mount on the left side of the window Diecast constructed housing and crank Hardened steel constructed arm and drive gears Equipped with a diecast crank handle and a 9 inch long hardened steel arm Installs with 4 screws. 1 pair spaced apart at 3-7/8 inch on center, and another pair at 4-3/4 inch on center Square housing with aluminum painted finish Please refer to the line art drawing for dimensions and compare with your needs before ordering