Machinist Machining Quality Tiny Drill Bits For Watch Clock Repair Toy Making Model Cars Trains Trucks Boats Miniature Modeling Jewelry making CNC Circuit board production Hobbies Woodworking Soft Metals Arts and Crafts Installation more... These micro drill bits are of the highest quality. They are made in Japan and used in South Korea by the Samsung company. They can be used for many things. They are great for making precision holes for those in the arts and crafts field or those who just dabble. The most common use is for making jewelry. Bits from China will get the job done, but the precision quality and durability of these Japanese bits from the Union company make them essential to jewelry makers. In addition to those uses, these bits are used by the largest companies in the world. They are the only bits that Samsung will use in their production of any circuit boards, whether it be for cell phones or computer chips.