The quenching copper material super it is for hard ceramic glass
Super the chip, the carbide tool, the drill blade and the saw blade be conspicuous hard, the cut of the edge grinding, the ceramics, the glass, the skin and the rubber of the kitchen knife, the knife, the scissors, the sickle, skiing and skating
Eyes were not rough, too fine, too difficult to clog with good roughness, well sharpened a few times lightly just by moving along the saw blade, saw blade's sharpness returned. It is also good that the handle is easy to grasp and is not slippery. Things that are cheap in price have something that makes the diamond ruffled and it will be useless, but I think that cost performance is good because there is no feeling that this file can be removed so far even if it is used quite roughly.