Asp Pcbn (polycrystalline Cubic Boron Nitride) Cutting Tool Blanks are Comprised of a Polycrystalline Layer of Cbn Crystals and a Tungsten Carbide Substrate Bonded Together as An Integral Compact By An Ultra-high Pressure and Ultra High Temperature Process. Asp Pcbn Cutting Tool Blanks are Used to Machine Ferrous Metals such As: Hardened Steel Wear-resisting Cast Iron, Heat-resisting Alloy, and Powdered Metal and So On. Asp Pcbn Blanks are Available in the Standard Shape of Round, and Can Be Processed per Customer's Request in a Wide Variety of Sizes and Shapes Including Rectangular, Square, Triangle, and Fan-shaped (semi-circle) and So On.