The Hellfire is a true 4 blade heavy duty braodhead perfectly suited for large game. The main and secondary blades are made from knife grade stainless steel, hardened to 50 rockwell and serrated the last 40% of each blade. The razor sharp blades are interlocked creating an exceptionally strong and rigid front section. 150 grains, 4 blade, screw-on .048 blade thickness. Main blade: 2-9/16" x 1-3/16".