All awning & hopper windows occur Outfitted with our exclusive MHB WML locking method, a multipoint locking method which has been engineered to fit our extremely-trim steel profiles. Delivering exceptional protection and due to the wonderful insulating properties of our awning windows maximizing your ease and comfort. Metallic conducts warmth http://www.northlandhq.com/directory/listingdisplay.aspx?lid=29854