I have french doors and want the kind of deadbolt that has to be keyed on the interior as well as the exterior. I am confident I can find them as I already have two in place.A. Dexter, as well as a number of other brands, have those kinds of deadbolts. They are called Double Cylinder deadbolts. If you do a general search for Double Cylinder Deadbolts, many options will come up. Dexter is one of the more specialized brands for security as well.
We still have product details, accessories, replacement parts and reviews below, scroll down to see them!