One operator, one crank handle, and installation screws. Worm gear mechanism driven. Steel Arm. Square type has 3/8 Inch diameter spindle. Teardrop type has 5/16 Inch diameter spindle. Used on steel framed windows. Hole spacing for screw is 3-7/8 inches and 4-3/4 Inches. Handing of window is determined from inside.
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