The Jambmaster Jig allows users to do fast, precise door frame installation without wedging or shimming. It's incredibly easy to learn how to use and requires very little training to use properly. Jambmasters can be used on any width of door from 18" to 60". You can also install doors of non-standard sizes with an adjustment to the Jambmaster system. Doors installation doesn't have to be a challenge - you can learn to install a door in 7 minutes or less with a Jambmaster jig! Additional router templates can be installed or removed from vertical uprights. If you are facing the prospect of door frame or door installation, don't fret. The Jambmaster system is designed so that anyone can master door repairs and installations - and you'll save time and money by doing the project on your own.