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2. Annular cutter - Wikipedia

   en.wikipedia.org/wiki/Annular_cutter

   A tungsten carbide tipped (TCT) and high-speed steel (HSS) annular cutter (also known as a "core drill" or "hole saw"). 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.

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

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

   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 and thick walls maximize durability and efficiency ...

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

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

   4-Cutter SDS+ Carbide Hammer Drill Bit Masonry Kit. If you plan on drilling through concrete with rebar, save yourself time and money by using these heavy-duty Milwaukee bits.

5. Hole saw - Wikipedia

   en.wikipedia.org/wiki/Hole_saw

   Tungsten carbide hole saw with arbor 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.

6. Carbide saw - Wikipedia

   en.wikipedia.org/wiki/Carbide_saw

   In 1973, Metalcut developed the first carbide rail saw which was later produced by other companies including Wagner. In 1997, AME developed an economical rail saw under the brand name AMSAW 300-R, which is still widely used throughout the U.S. In 1999, AME built a special model of a carbide saw for miter-cutting railroad rails for frogs and ...

7. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   1.25 in (32 mm) hole saw bit. Hole saws take the form of a short open cylinder with saw-teeth on the open edge, used for making relatively large holes in thin material. They remove material only from the edge of the hole, cutting out an intact disc of material, unlike many drills which remove all material in the interior of the hole.