screws 58 to the door frame these parts can be assembled to form a strike 25 for an outswinging wood door or a strike 25a for an outswinging metal door as shown in fig2 thus an inexpensive kit of simple parts allows the lock 100 to be adapted to many different installations both inswing and outswing fig2 and 7 show the lock 100 in which the plunger 11 need not be provided with an extension 44 instead an inside knob 4b is provided with a screw 50 offset from the axis a 39 the back casing 16 is formed with a center hole 51 and two side holes 52 around the hole 33 the screw 50 can be screwed down into the hole 51 to lock the knob 4b against rotation thereby making it necessary to use solenoid action to open the door from the inside the screw 50 can be screwed down into either of the holes 52 also to hold the bolt 8 in the withdrawn position a screwdriver 55 allen wrench 55a or the like can be used to move the screw 50 in or out thus it is possible to change the style of operation of the lock 100 in a very simple manner using simple tools a recessed backset plate may be used as well as a slightly different.