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Parallel Window HingeHB2230 Friction Stay 1) Parallel opening hinge for translational windows. 2) Parallel opening windows provide ultimate natural ventilation by allow around the entire opening 3)Can be connected to a building management system as part of an at climate control 4)Better effection with actuators for window . 5) Sash adjustment feature for use with heavier vents 6)Hinge mechanism is fully conceale when the sash is closed 7)Adjustment friction mechanism for controlling manually operated sash 8) Tested to mininum 30,000 cycles 9)Material: ss202,ss301,ss304 we are specializes in manufacturing and marketing the best quality door&window hardwares for past 12 years. With main products of friction hinge,window handle,roller,lock, hinge, driving rod.Welcome to visit our website:http://yuandawj.preview.alibaba.com. The tenet of our company is best quality and best reputation, we earn the good reputation from our customers by the most reasonable prices. If any of the items listed in the catalogue meets in your interest, welcome to contact us to inquire more information, we assure you of our best services at all times.