High precision indexable end mill with two effective cutting edges. Corner radius accuracy: within plus/minus 0.01mm. High precision and high rigidity clamping system. Adoption of the same clamping system as the Mirror Ball. This system already has wide industrial approval. Excellent bottom edge run-out. Establishment of high precision below 0.005mm which no one can duplicate. Realisation of high precision machining. Superior surface quality and minimum deflection are better than those of competitors. Inserts can be used in Mirror Ball bodies, in case of finishing application of cutting stock below 1/40 x D. Insert locates accurately in any of the two positions it is entered into the body.