Power Shears include Hydraulic, Pneumatic and Mechanical Shears. Newer style mechanical shears are economical to operate since the design only calls for the motor to run for the duration of the cutting cycle and then it shuts off until the next cut cycle. Older mechanical shears are flywheel type drives which run even while waiting to cut, they require high startup current but generally offer quicker cycle times. Pneumatic Shears are lighter duty machines and are a good option for shops with compressors but have limited power available. Hydraulic shears are powerful shears that meet a wide variety of needs and a broad range of sizes.