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  2. 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. [1]

  3. 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 ...

  4. Drill bit - Wikipedia

    en.wikipedia.org/wiki/Drill_bit

    A diamond core drill bit is intended to cut an annular hole in the workpiece. Large bits of similar shape are used for geological work, where a deep hole is drilled in sediment or ice and the drill bit, which now contains an intact core of the material drilled with a diameter of several centimeters, is retrieved to allow study of the strata.

  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. List of screw drives - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_drives

    A set of torq-set bits. Torq-set is a cruciform screw drive used in torque-sensitive applications. The Torq-set head is similar in appearance to a Phillips drive in that it has a cross with 4 arms. In Torq-set however, the lines are offset from each other, so they do not align to form intersecting slots across the top of the head.

  7. Year-end financial checklist: Your complete guide to ... - AOL

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    Take control of your financial future with this detailed checklist covering everything from your savings and investments to insurance needs and estate planning.

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