Casement windows are attached to the frame with a hinge. Some models have a locking handle, and are opened and closed by hand. Other casement windows have a crank. The crank is operated when turned clockwise or counterclockwise. If the operator crank does not work properly, the window will not open or close, or it may stick when partially opened. Replacing the crank operator will make your casement window open and close in a fluid motion.These handles are suitable for different material door & windows, for example UPVC,Aluminum or steel. Fixed inner or outer of the door/window are available.Powder coated in standard color: Silver, beige, white, black, light champagne, brown or according to customer requirements.Specification1.Excellent surface;2.Long life performance;3.Durability & Adjustable.4.OEM are welcomeOur products are with remarkable quality and best price. If you have special requirements, we can custom-make products to your specification also.Our Advantages1. High quality2. Professional supplier3. Wide range4. High capacity5. Competitive Prices and on-time delivery