The Bush Hog® SBX Series Box Blades are exceptional tools when the job requires grading, leveling or back filling. The scarifiers have three adjustable height positions and replaceable heat-treated tips for extended wear. Two 1/2 x 6-inch heat-treated, reversible and replaceable cutting edges smooth even the roughest ground. Rated for use on 2WD tractors up to 50 PTO horsepower and 4WD tractors up to 35 PTO horsepower, these box blades provide excellent value for the price.