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2. Screw extractor - Wikipedia

   en.wikipedia.org/wiki/Screw_extractor

   A screw extractor held in a tap wrench. A screw extractor is a tool for removing broken or seized screws. There are two types: one has a spiral flute structure, commonly called an easy out after the trademarked name EZ-Out; [clarification needed] the other has a straight flute structure. [1]

3. Harbor Freight Tools - Wikipedia

   en.wikipedia.org/wiki/Harbor_Freight_Tools

   Harbor Freight Tools won a declassification of the class action; that is, the court found that all the individual situations were not similar enough to be judged as a single class, and that their claims would require an individual-by-individual inquiry, so the case could not be handled on a class basis.

4. Core drill - Wikipedia

   en.wikipedia.org/wiki/Core_drill

   This is the reason that diamond-tipped core drills are commonly used in construction to create holes for pipes, manholes, and other large-diameter penetrations in concrete or stone. Core drills are used frequently in mineral exploration where the drill string may be several hundred to several thousand feet in length. The core samples are ...

5. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   The brad point drill bit (also known as lip and spur drill bit, and dowel drill bit) is a variation of the twist drill bit which is optimized for drilling in wood. Conventional twist drill bits tend to wander when presented to a flat workpiece. For metalwork, this is countered by drilling a pilot hole with a spotting drill bit.

6. Pilot hole - Wikipedia

   en.wikipedia.org/wiki/Pilot_hole

   For common wood screws, the pilot providing clearance for the core of the screw may be followed by a larger bit to shallower depth to provide clearance for the larger, unthreaded shank of the screw. For standard wood screws, special pilot drill bits are manufactured to produce the correct hole profile in a single operation, rather than needing ...

7. Drill bit sizes - Wikipedia

   en.wikipedia.org/wiki/Drill_bit_sizes

   A #80 drill bit. Number drill bit gauge sizes range from size 80 (the smallest) to size 1 (the largest) followed by letter gauge size A (the smallest) to size Z (the largest). Although the ASME B94.11M twist drill standard, for example, lists sizes as small as size 97, sizes smaller than 80 are rarely encountered in practice.