The NC (Numerical Control) Drill file defines hole locations, tool numbers and finished hole sizes (X&Y coordinates). For Prototype(Engineering Level = No Engineering Run as Sent on quote form) PCBs, all holes will be treated like plated through holes. The following two design features could create a difference between the design file and the received PCBs:
For Prototype boards (Engineering Level = No Engineering Run as Sent) on the quote form) PCBs: Specified holes < 0.018" will be treated as vias, and drilled approximately the same size as specified. The smallest available bit is 0.0135". If your drill is smaller, it will be increased to this size.
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