Gear Box for
55-111CP Handle Set Assembly for Swing Door.
Manufactured by Roto.
Backset: 1-25/32" (45mm).
If replacing an Old Style Gear Box (see the two
listed as obsolete in the picture above) with the New Style Gear Box (56-106 or
56-105) the door will need to be notched out 23/32" to accept the position of
the New Style Gear Box. Also, the Strike Plate
need to be lowered 23/32" to line up properly with the Latch and Dead Bolt on
the New Style Gear Box.