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2. Core drill - Wikipedia

   en.wikipedia.org/wiki/Core_drill

   Truck-mounted core drill. A modern core drill is a drill specifically designed to remove a cylinder of material, much like a hole saw. The material left inside the drill bit is referred to as the core. Core drills used in metal are called annular cutters. Core drills used for concrete and hard rock generally use industrial diamond grit as the ...

3. Annular cutter - Wikipedia

   en.wikipedia.org/wiki/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. Oregon Tool - Wikipedia

   en.wikipedia.org/wiki/Oregon_Tool

   Oregon Tool, Inc. is an American company that manufactures saw chain and other equipment for the forestry, agriculture, and construction industries. Based in Portland, Oregon , Oregon Tool globally manufactures their products in ten different plants across five countries.

5. This DeWalt brand drill set is nearly half off during Black ...

   www.aol.com/lifestyle/this-dewalt-brand-drill...

   Get 50% off this bestselling drill set from Dewalt during Black Friday. The set comes with a drill, driver, battery charger, carrying case, and two batteries.

6. Plug and feather - Wikipedia

   en.wikipedia.org/wiki/Plug_and_feather

   Evidence of this method for cutting obelisks in the quarries of Aswan can clearly be seen. [4] The technique was also used by the Romans. [5] On Dartmoor, Devon, England, the process is known as feather and tare and it was used from around 1800 to split the large blocks of granite found on the ground there. [6]

7. Core sample - Wikipedia

   en.wikipedia.org/wiki/Core_sample

   Rock core samples, the product of a diamond rig. A pied butcherbird perches nearby. A core sample is a cylindrical section of (usually) a naturally-occurring substance. Most core samples are obtained by drilling with special drills into the substance, such as sediment or rock, with a hollow steel tube, called a core drill. The hole made for the ...