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10 pack Japanese Drill Bits Micro Tool Dremel Cutter High Speed Sizes (2 of each) .10mm x 1.7mm .15mm x 2.5mm .20mm x 4mm .25mm x 4.5mm .30mm x 5mm About our bits: These bits are made for extreme production PC board and Cell phone manufacturing in Korea. They are made from the highest quality steel money can buy for this type tool at an affordable price. These will far outlast any cheaper bit you can buy at the local hardware stores and will amaze you with their durability. These are designed to work in a rapid production environment in multi-million dollar facilities all day, 7 days per week. These are brand new in the box and they are ready to go to work today.