Check the listing for details. Parts Express Nickel Plated Nibbling Tool. Condition: New. Listed at 15.99 USD. 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.