I have four steel exterior doors that only have knob-locks on them and I'd like to install a deadbolt for a little extra security. In the home centers I see kits for the installation of these locks but they usually only show pictures of wood doors.
My steel doors do not have any pre-cutouts for the deadbolt. The casing is wood, so I am OK using a drill/chisel there. But I have no idea whether I can install a deadbolt on a steel door. I see from Ask This Old House that Tom Silva has done the installation on a wood door at http://www.thisoldhouse.com/toh/video/0,,1631601,00.html