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2. Plug and feather - Wikipedia

   en.wikipedia.org/wiki/Plug_and_feather

   The working principle of the plug and feathers. Each set consists of a metal wedge (the plug), and two metal shims (the feathers). The feathers are wide at the bottom, and tapered and curved at the top. When the two feathers are placed on either side of the plug, the combined width of the set is the same at both ends.

3. Annular cutter - Wikipedia

   en.wikipedia.org/wiki/Annular_cutter

   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] An annular cutter is a more expensive and efficient alternative to spiral drill bits and standard hole saws. An annular cutter is similar to a hole saw but differs in geometry and material.

4. Plug - Wikipedia

   en.wikipedia.org/wiki/Plug

   Plug, PLUG, plugs, or plugged may refer to: Plug, an insertive closure or stopper (plug) Core plug, used to fill the casting holes on engines; Butt plug, a sex toy that is inserted into the rectum; Earplug for ear protection; Plug (sanitation), a stopper for a drainage outlet; Plug (accounting), an unsupported adjustment to an accounting record

5. Cookiecutter shark - Wikipedia

   en.wikipedia.org/wiki/Cookiecutter_shark

   Based on catch records, the cookiecutter shark appears to conduct a diel vertical migration up to 3 km (1.9 mi) each way. [6] It spends the day at a depth of 1–3.7 km (0.62–2.30 mi), and at night it rises into the upper water column, usually remaining below 85 m (279 ft), but on rare occasions venturing to the surface.