Manual window openers are mainly composed of hand-crank upper, middle, and lower machines, curved and straight arms, hand-crank handles, and linkage rods for opening and closing windows. They are generally suitable for industrial factories, warehouses, stations, airports, cinemas, auditoriums, canteens, and more. The main types of windows they are used for include: center-hung, top-hung, bottom-hung, sliding, and sloping windows. The product features a fully aluminum die-cast shell, a large curved arm for increased power, and can link 1-10 windows. The adjustable height support and easy installation make it a beautiful and practical design with excellent wear and corrosion resistance, and simple maintenance.