cover plate is provided having several holes with removable center sections and which can be inverted thereby maximizing the number of deadbolt sliding bolt locations which can be accommodated application_number US 74586285 A description fig1 illustrates door jamb construction 10 installed within a building wall 12 and employed to support door 14 door 14 is attached for pivoting about hinge jamb 16 by two or more spaced apart hinge assemblies not shown door jamb construction 10 further comprises header 18 lock jamb 20 and threshold 22 door 14 typically includes an entrance lockset 24 having a sliding locking bolt 26 which engages with lock jamb 20 to maintain door 14 in a closed position door 14 may further include a deadbolt security device 28 which also engages with lock jamb 20 to provide additional security typically entrance lockset 24 is mounted below the horizontal centerline of door 14 to locate it in a convenient position to be grasped by pedestrians fig2 through 7 and 11 provide detailed views of the configuration of components making up door jamb construction 10 door jamb 10 generally comprises a number of elongated components having metal exterior surfaces with hollow interior cavities which are filled with a plastic foam material 70 such as polystyrene or polyurethane foam which provides excellent thermal insulation properties fig2 is an exploded view of door jamb 10 showing the various.