Anhui Friand Auto Parts Co.,Ltd produce more than 20 models bus and coach safety top window, ventilation and skylight. We could send you our catalog about bus top window and detailed specifications. Your sincere inquuiry will be highly appreciated and we will do our best to make our products suit for your requirements and it will be pratical and easy to open and close. Currently, we have our own brand top window and hope you will be interested in them.