B20-PIECE MICRO DRILL BIT SET ReviewbP PP 20-PIECE MICRO DRILL BIT SET PMicro Bits And we do mean micro. Sizes #61 to #80 (yes, that is twenty different bits) which are from 0.013 to 0.038 inches diameter!! The big boys sell a set of similar bits (carbon steel, like ours) for about $30.00!! Maybe theirs aren't from China.