Iron metal is not in finish machining, especially when aluminous material, cut bits for effective control, foreign development goes a kind to contain bit implement PCD razor blade. This kind of razor blade is the bit of hard alloy matrix that has blade of integral PCD cutting. Hard alloy breaks bits implement on matrix be been in by direct solder, because this disappear is mixed besides diamond,break bits implement the aperture between, can avoid to cut bits to jam. Circumferential cutting speed is this razor blade 250m/min, feed is 0.