An alligator shear, historically known as a lever shear, is a metal-cutting shear with a hinged jaw, powered by a flywheel or hydraulic cylinder. Alligator shears are generally set up as stand-alone shears, however there are types for excavators. The jaw size can range from 4 to 36 in long. They are generally used to cut steel members, such as rebar, pipe, angle iron or I-beams.Older alligator shears were powered by a flywheel. These shears ran continuously, which posed a safety hazard. Now alligator shears are hydraulically actuated. When actuated, the piston arm extends and slowly closes the upper jaw of the alligator shear, which passes alongside the bed or lower jaw of the shear to perform the cut.

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