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• [Precautions] • Use a pin vice suitable for the drill size, and secure the drill blade firmly to the chuck.　・When drilling an ultra-fine drill of 1 mm or less, be sure to "take care" and "do not overwork" at a "right angle."　・When the hole penetrates, pull it out slowly at a right angle.　・When the workpiece is metal, apply cutting oil.　・When using a drilling machine, use a special pin vice or check the chucking ability before using.　・Cutting chips and small parts may be scattered during the work, which is very dangerous. Please use protective glasses.