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Hi Bryan, A nibbler cuts little nibblets, about 3/32"long x 3/8" wide. If not held correct, a nibbler will self feed and be hard to control a straight cut. Nibblers are used mostly on 12/14ga material for ruff cutting. Doubble cuts, cut a 1/4" wide strip out. Very easy to control, cuts round surfaces easy, and leaves a very nice finished edge. Can self feed but that don't happen offten and easy to stop when it does. Cuts straight/circle lines more easy. Cutting Capicity too 18ga. Uni-shears cut like a pair of scissors, so one side of the material has to be lifted to give relief too the cut. Great for accurate cuts on both straight and round cuts on "flat" sheets. Capicity 16ga. Doesn't work well for cutting decking or heavy ribbed sheeting. Hand shears, M-1 right cut green handle, M-2 left cut red handle, M-5 bull dogs red handle (great for cutting standing ribs) made to cut heavy material 18ga. Wiss still makes a good hand shear, about 20ga capicity. I use the M5's for my throw away shears for abuse cutting, cutting too thick of material. Makita 5", model 9005, side grinder with a 6"x3/32" cut off wheel works well for cutting several sheets to the same length, stacked. At 10,000rpm it is a very high risk injury tool if not used correct. A full face shield with safety glasses, leather gloves, is minimum required. If you smell leather burning, it's time to go get stitchs. Cutts like butter even thru SS with a straight edge depending on users skill. 1/2" SS plate cuts nicely. does leave a burr that needs to be removed. My choice for working siding/roofing: M1,M2, M5
doubble cuts
Makita 5"
Milwaukee drill motor. cordless works well and depending on construction method, two drill motors. T_Bone
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