Check the listing for details. For Turning Milling Tools Surfacing Cylinder Head、Block RNGN120400A CBN Insert. Condition: New. Listed at 35.69 USD. For Turning Milling Tools Surfacing Cylinder Head、Block RNGN120400A CBN Insert 1PCS Use for block and head resurfacing; vertical milling and boring. Exceptionally high abrasion resistance and good surface finish. Outstanding impact strength and good tool life. PCD for aluminum; CBN for cast iron. Product Description Polycrystalline Diamond (PCD) is a synthetic diamond. PCD Tipped Tools are the best to use in finishing and super fine cutting process at high speed for machining non-ferrous and Non-Metallic material, e.g. boring aluminum, turning aluminum-silicon alloy, milling copper alloys, etc. Also it can bore cast iron, groove wood (Fiberboard, hard wood), drill composites (Graphite-Epoxy, Carbon-Carbon Fiber, Fiberglass Plastic), countersink Ceramics (Sintered, Unsintered), ream Tungsten Carbide (Sintered, Unsintered), cutting Bakelite, Phenolic resins, polypropylene, pottery, microcrystalline glass, etc