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Hi Rick, I like a Uni-shear for general flat SM work as it cuts tight arcs and is easy to cut straight lines. Uni-shear, cuts like a pair of scissors but needs the left side of the cut lifted for relief while cutting with no metal loss. Easy to control cut line "once" you learn how. 16ga capicity but there's a 18ga capicity Uni-shear thats works well for bench work. Will self-feed sometimes (continue cutting when held in the correct position). Double cuts, uses the scissor motion between two blabes and cuts a 1/4" waste strip out and 18ga capicity. Great for field work for cutting round and square duct and such. Easy to control with-in the line. Northern Tools incorrectly states thease are nibblers. They are not nibblers. Hard to make self-feeding. Nibblers, takes a nibblet cut, small 3/32" x 3/16" nibblets, mostly used for heavy gauge metal, 10ga. Will self-feed easy making the line hard to follow. T_Bone
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