Aluminum Roof Hatches are both lighter weight and often consider a more attractive option than the galvanized steel models.  They are slightly more expensive than steel models, yet can save you on labor costs due to the lighter weight and easier installation.  They are also more corrosion resistant require little to no maintenance.  We carry both Bilco and Babcock-Davis but if you do not see the size or model you are looking for, please call (800) 267-2308 and ask for an E-Commerce representative.