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2. Hole saw - Wikipedia

   en.wikipedia.org/wiki/Hole_saw

   A 52 mm (2.0 in) hole saw with pilot bit. A 115 mm (4.5 in) diamond hole saw. A hole saw (also styled holesaw ), also known as a hole cutter, [ 1] is a saw blade of annular (ring) shape, whose annular kerf creates a hole in the workpiece without having to cut up the core material. It is used in a drill. Hole saws typically have a pilot drill ...

3. Annular cutter - Wikipedia

   en.wikipedia.org/wiki/Annular_cutter

   Annular cutter. An annular cutter (also called a core drill, core cutter, broach cutter, trepanning drill, hole saw, or cup-type cutter) is a form of core drill used to create holes in metal. An annular cutter, named after the annulus shape, cuts only a groove at the periphery of the hole and leaves a solid core or slug at the center.

4. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   Drill bit. From top: Spade, brad point, masonry, and twist drills bits. Drill bit (upper left), mounted on a pistol-grip electric drill. A set of masonry drills. A drill bit is a cutting tool used in a drill to remove material to create holes, almost always of circular cross-section. Drill bits come in many sizes and shapes and can create ...

5. The Best Hole Saws for Creating Perfectly Round Holes in a ...

   www.aol.com/lifestyle/best-hole-saws-creating...

   7-Piece Hole Cutter Set. $179.99. amazon.com. More. 6-In. Bi-Metal Non-Arbored Hole Saw. If you need to make large holes for vents or can lights, consider this six-inch Lenox saw. The large teeth ...

6. Keyhole saw - Wikipedia

   en.wikipedia.org/wiki/Keyhole_saw

   Keyhole saw. A keyhole saw (also called a pad saw, alligator saw, jab saw or drywall saw) is a long, narrow saw used for cutting small, often awkward features in various building materials. There are typically two varieties of keyhole saw: the fixed blade type and the retractable blade type. The retractable-blade variety is usually found to ...

7. Trepanning - Wikipedia

   en.wikipedia.org/wiki/Trepanning

   Trepanning, also known as trepanation, trephination, trephining or making a burr hole (the verb trepan derives from Old French from Medieval Latin trepanum from Greek trúpanon, literally "borer, auger"), [ 1][ 2] is a surgical intervention in which a hole is drilled or scraped into the human skull. The intentional perforation of the cranium ...