second concave blade 3 and the primary cross brace 72 the gussets 74 provide a means of connecting the primary cross brace 72 of the mounting means 39 to the v blade 43 in such a way as to achieve a high strength and torsion resistant tree cutting device in a low cost and easy to manufacture design in the preferred embodiment the gussets are constructed of a 36 plate steel and are of the dimensions 3 8 34 thick as shown in fig1 and 4 the side arms 70 are also secured to wings 33 the wings 33 extending rearward from the outer periphery of the first and second concave blades 2 and 3 such that the side arms 70 of the mounting means 39 may be connected thereto by welding or otherwise in the preferred embodiment the wings 33 are constructed of a 36 plate and are of the dimensions 3 8 34 thick in addition to providing a means of connecting the mounting means 39 to the v blade 43 the wings 33 prevent trees and other debris from rolling off the outer edges of the v blade 13 and being dragged under the prime mover as is shown in fig1 the v blade 43 comprises a pair of substantially flat sheer blades 20 and 21 each having a cutting edge 22 the.