Latch forming tool for lock installations, for use on standard 18 gage steel doors. The Pit Bull tool is used to form a rectangular pocket in the edge of a hollow metal door. Application of the tool is almost effortless, simply drill the latch and cross bore holes and install the Pit Bull. Using a few turns with a wrench will squeeze an indentation into the door`s edge. The result is a pocket that will accept both 1" and 1 1/8" wide by 2 1/4" tall latches.Please see companion tool, the HIT-24 to help you locate the strike location.