A door jamb is the frame onto which a door is secured. Most types of door fasteners and dead bolts extend into a recess in the door jamb when engaged, making the strength of the door jamb vitally important to the overall security of the door. The standard jamb for each door may vary depending on the style and specie of the door.
Veneer - (Particle board core)
Hard Edge - (Particle board core w/solid hard-edge)
Trimmable - (Particle board core w/trimmable edge)
Lumber Core - (Finger joint core w/veneer wrap)