The NC (Numerical Control) Drill file defines hole locations, tool numbers and finished hole sizes (X&Y coordinates). For Prototype(Engineering Level = Limited Review 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 = Limited Review 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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Sunstone Circuits® is the established leader in providing innovative and reliable printed circuit board (PCB) solutions for the electronic design industry. Since 1972, Sunstone Circuits has delivered high quality, on-time PCBs and is committed to improving the prototyping through production processes for the design engineer from quote to delivery. With white-glove support, Sunstone Circuits provides unparalleled customer service and leads the industry with over 99% on-time delivery.