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2. Self-tapping screw - Wikipedia

   en.wikipedia.org/wiki/Self-tapping_screw

   Self-tapping screws can be divided into two classes: [3] those that displace material (especially plastic and thin metal sheets) without removing it, known as "thread-forming" self-tapping screws, and self-tappers with sharp cutting surfaces that remove the material as they are inserted, termed "thread-cutting" self-tapping screws.

3. Countersink - Wikipedia

   en.wikipedia.org/wiki/Countersink

   Countersink cutters are manufactured with six common angles, which are 60°, 82°, 90°, 100°, 110°, or 120°, with the two most common of those being 82° and 90°. Countersunk-head screws that follow the Unified Thread Standard very often have an 82° angle, and screws that follow the ISO standard very often have a 90° angle. Throughout ...

4. Glossary of early twentieth century slang in the United States

   en.wikipedia.org/wiki/Glossary_of_early...

   Louise Brooks styling a "shingle" bob cut in 1929 bob cut. Main article: Bob cut. There were various bob haircuts, but the most common involved cutting both the bangs and back in a straight line, typically with the back shorter and off the neck i.e. shingle bob; e.g. Most flappers had their hair bobbed [41] bohunk. Main article: List of ethnic ...