I needed to drill thread size hole inside a piece of plastic, I thought about doing it with a hot needle but did not want any heat mangling in the area. I bought this and did not expect much. The case is hard to open, need to use a screw driver and open very gently or all the pieces will fall. I used the pieces with my deremel to drill the plastic piece. I was very please with the results. I can not do with out this bits at this time. I wiahed I had a better case. The bits are too small for any of the case that I have.Get more detail about 20pc MICRO-DRILL BITS INDEX 61-80 w/ Plastic Case.
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