JK8 Series 65 degrees steel knife with a round nose R 4F, fine particulate material, particle size 0.2, helix angle of 45 degrees, matte black coating. Standard D4R1.0 * 8 * 50 * 4, extended specifications D4R1.0 * 8 * 75 * 4 * 4F, D4R1.0 * 8 * 100 * 4 * 4F. 25,25-38 mainly for cutting ordinary steel, alloy 48, 48-56,56-62 pure hard steel, gray iron, ductile cast iron black. 65 adapted to pure hard steel, stainless steel, Shen Dian hardened stainless steel, aluminum, magnesium and aluminum alloys, nickel-based superalloy and titanium alloy material.