CASE style end 580L & 4-in1 bolt on cutting edge. Through hardened guaranteed against breakage. This is a double beveled cutting edge that is .75" thick, 6" wide, and 82.008" in length. It takes 10 - .75" grade 9 plow bolts and 10 - .75" nuts. The bolt spacing is center of all holes respectfully 8.500". The space length is 2.756" from the center of the first hole and the center of the last hole to the edge of the cutting edge.