AP Products 012-PSQ500 W 8 X 1-1/4 White Pan Head Square Recess Screw - Pack of 500 Full 3/4" insulating glass provides optimum thermal performance. Optional Low-E coated glazing is available Sash tilts inward and can be removed for cleaning from inside the home Interlocking meeting rails provide a superior sealing system that will keep out wind and water The narrow frame and sash profiles allow a large glass area for maximum exterior view Heat fusion welding bonds the frame and sash corners, preventing water and air infiltration at the joints