•Maintenance-free and high-performance shaft putter window provides a strong driving force for push-axis window runs smooth and reliable. • Especially suitable for the sub-roof opening • Silver oxidation corrosion resistant aluminum alloy shell. • Stainless steel push-axis for choice • The activities of adjustable bracket, easy to install • Ddsign life : open and close windows and doors for more than 30.000 times • Protection grade : IP65 If you want to know some more informations, please contact usat any time, we would be honoured to eastablish the business relationship with you !!