We carry around 80 different keyhole escutcheons in a variety of styles in both iron and brass. Escutcheons can be divided into two distinct categories. A third style called the flanged thread escutcheon has attributes of both, its body is mortised into the keyhole while it's bead like flange sits on the surface. . The escutcheon is pinned into place and can cover a relatively crude job of keyhole cutting. Surface mounted escutcheons are often made to match a handle so a unified design can be realized.
Modern locks can make surface mounted escutcheons harder to use.
Select a thread escutcheon based on its visual effect on the furniture rather than the fit of the key. Installing a thread escutcheon is straightforward though not as easy as fitting a surface mounted escutcheon. Due to their greater vulnerability they are usually fixed with small pins through holes both up and down into the surrounding wood.