The Truth Hardware (AmesburyTruth) 15 Series Ellipse Left-Hand 13-1/2" Single Arm Casement Window Operator (15.32) is designed for use in casement windows, pairing perfectly with AmesburyTruth 14 Series Casement Window Hinges. Often referred to as a window crank, window mechanism, or window opener, this left-handed operator is engineered to support window sashes weighing up to 55 lbs (25 kg), with widths ranging from 20" to 24" (508 mm - 610 mm) and heights up to 65" (1651 mm).

This operator is commonly identified with the stamp "45251" on the arm, though you may also encounter alternative markings such as 40051, 40052, or FASCO branded markings like 239135L or 239135R.