"King Kutters XB Box Blade's rugged patent-pending design is great for landscapers, farmers, light construction and more, including land leveling, backfilling and grading. Each box is constructed with a 12in. specially formed self-cleaning moldboard. Features Flip up EZ ripper shanks with replaceable heat-treated teeth. U.S.A. Blade Type Box, Recommended For Category 1 subcompact tractor hitch, Category Type 1, Working Width in. 48, Hitch Type 3-pt., Product Type Box blades/box scrapers, Material Type Steel. Each box blade has a 12in. self-cleaning moldboard Front and rear high carbon, heat-treated steel cutting edges Flip up EZ ripper shanks with replaceable heat-treated teeth 2 x 4 rectangular box shank housing Category 1 subcompact tractor hitch with Category 0 spacing"