The back and end plates are 2" taller and thicker to handle a bigger load. The height adjustable 3 hole ripping shanks (scarifiers) with replaceable tips, can be lowered to tear up the ground while the back of the box is raised by shortening the top link to allow the material to flow out under the back cutting edge. Then the back can be lowered to provide a smooth level finished area. This box is a good heavy duty box to handle farm or construction work requirements. The front and rear 1/2" x 6" Beveled, Hardened Steel Cutting edges are Reversible and Replaceable.