Sold on Amazon Genuine OEM Brown Bededger 4" Rotor. Fits specific Brown Bededger models. Different sized rotors designed to dig 3", 4" or 5" deep and slops 6" to 8" back into bed. The 3" BedMaster rotor is designed for bed defining. The 4" and 5" are designed for installing steel or plastic edging, bricks, paving stones or other edging materials.