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What Size Drill Bit For 10 Screw; ... A short, slender, sharp-pointed metal pin with a raised helical thread running around it and a slotted head, used to join things ... Armstrong Metalcrafts does prototyping and produces devices that stimulate the imagination, spark a conversation, and enlighten the soul. Also known as pin-in-hex, install and remove these screws with a tamper-resistant hex driver. Made from 18-8 stainless steel, they are chemical resistant and may be mildly magnetic. They penetrate 0.025" and thinner sheet metal. Length is measured from under the head. For technical drawings and 3-D models, click on a part number. While installing shelving in my home, I had to drill pilot holes for #8 and #12 Metal Screws into studs. The problem was, I didn't know how big to drill the holes and when the holes were too small, it was quite difficult to drive the screws into place.