It’s not unusual for shears to be called nibblers, but that’s not really correct. Shears cut like powerful scissors. Nibblers take out a series of small chunks – or bites – which is where they get their name. Because they actually remove material, nibblers shouldn’t be used for cutting accurately along a line. However, they can cut a very tight circle and are often used on corrugated steel, which is awkward to cut with shears.