3/8 X 2-1/2 X 13 INCH FERTILIZER KNIFE - YETTER STYLE WITH COULTERFor the Yetter 20" Coulter Front swept knife for fertilize application behind a coulter. 3 8" x 2 1 2 " x 13" with 1 2" stainless crushed open ended tube. Has no tube protector. Interchange 97236311770, Net Weight (lbs) 3. 60 AgSmart Fertilizer Knives are designed to be: Rugged Long Lasting Durable With a full range of options including carbide edge, stainless tubes, and designs for multiple applications, SMA has you covered.