By admin filed under glass doors; Our services are available across hampton roads with on. Vintage pebble glass front door with hardware including Available in several architectural finishes. How to install mail slot in glass door . If you're using a sleeve, put it in place now to ensure that it will fit. Drill pilot holes on the screw hole marks. This frameless mail slot is for 1/2 inch (12.7 millimeter) thick all glass commercial entrance doors. A simple 6 feet (1.8 m) glass door will cost around $300. Mail slot sleeves are available to fit in the opening between the front and rear faceplates. Hold the mail slot at the desired height on the interior side of the door, and make a small pencil mark along the bottom of the mail slot. We get a pile of magazines and catalogs delivered every day and couldn’t find a box large enough, so we installed a mail slot in the front door. An exterior mail slot cover (or lid) covers the mail slot so that the home remains insu...