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2. Pilot hole - Wikipedia

   en.wikipedia.org/wiki/Pilot_hole

   A pilot hole may be drilled the full extent of the final hole, or may only be a portion of the final depth. The pilot drill may be a standard twist drill, another type of drill bit appropriate for the material, or, when the primary purpose is precisely locating a hole, may be made with a short, stiff center drill.

3. Bore Through Tough Concrete and Brick With These Masonry ...

   www.aol.com/lifestyle/bore-tough-concrete-brick...

   These 3/16-inch Bosch bits are the perfect size for drilling pilot holes for ¼-inch Tapcon concrete screws, and more than provide the minimum 1-inch depth required.

4. Raise borer - Wikipedia

   en.wikipedia.org/wiki/Raise_borer

   The raise borer is set up on the upper level of the two levels to be connected, on an evenly laid platform (typically a concrete pad). A small-diameter hole ( pilot hole ) is drilled to the level required; the diameter of this hole is typically 230mm – 445mm (9" - 17.5"), large enough to accommodate the drill string .

5. Directional boring - Wikipedia

   en.wikipedia.org/wiki/Directional_boring

   Directional boring tooling includes the suite of drill bits or drill heads used during pilot hole operations, reamers and hole-openers used for hole enlargement, and swab tools which are used for hole conditioning and pullback. Tooling intended to navigate rock, or tougher formations, may use tungsten carbide alloys or polycrystalline diamond ...

6. Bore Holes in Concrete, Wood, and Plastic With the Best ...

   www.aol.com/lifestyle/best-cordless-drills...

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7. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   A star drill bit, similar in appearance and function to a hole punch or chisel, is used as a hand powered drill in conjunction with a hammer to drill into stone and masonry. A star drill bit's cutting edge consists of several blades joined at the center to form a star pattern.