Tin snips are tools used to cut thin sheet metal.
http://cuttingtools.blogth.com/
Tin snips are tools used to cut thin sheet metal. They use the same
principles as common scissors, but are able to handle thicker and
harder material. There are three different types of tin snips;
straight cutting, left cutting, and right cutting. Straight cutting in
a straight line, left cutting snips (usually red) will cut in a curve
to the left, and right cutting snips (usually green) will cut in a
curve to the right.
http://cuttingtools.blogth.com/
In practical use the red snips pictured will be used in the right
hand, for straight or curving cuts, with the base material to the
right being cut neatly and the left hand will be pulling away a
spiraling offcut. The green snips work in the opposite fashion in the
left hand, with the waste being on the right.

A similar tool called aviation snips can cut sheet metal with less
effort than tin snips. A compound lever mechanism provides greater
control with less effort. The serrated jaws prevent slippage and
withstand heavy use. Also it is designed with a latch than holds the
jaws closed if desired. The insulated handles have the same color-
coding as with tin snips described above.
http://cuttingtools.blogth.com/
A tool called a hand notcher makes clean V-shaped cuts in sheet metal
without slippage. The compound-action handles produce necessary
leverage for fast cutting.
http://cuttingtools.blogth.com/

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