"Simply drill 3/8" hole insert cutting head and compress handles. Gives you the ability to make square holes for fuse holders, special connectors displays etc.
Material to be nibbled is placed in the gap between the punch and blade channel. By squeezing the handles together, the punch will move down into the channel, cutting out a slug of metal. A scribe line can be followed by looking down on work in this position. A slot is cut by making successive cuts. To make a sharp 90 degrees turn, pull the tool out of the slot. Turn the work 90 degrees and insert the tool again. By turning the tool before each cut, a 5/16" (7.9mm) minimum radius can be cut."