Our tree shear rotates 90 degrees. Easily shear trees at near ground level or shear branches by rotating the tree shear. The  shear moves with the ease of pulling two pins, rotating the shear, then reinstalling the pins.  The blade is 1 inch thick AR400. We made this a one blade system so the blade stays sharper for up to 4 times longer than a 2 blade system. Think about it, when 2 blades hit each other, they will get dull. Our blade does not come in contact with anything but the tree.