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2. Robertson screw - Wikipedia

   en.wikipedia.org/wiki/Robertson_screw

   Both the tool and socket have a slight taper. The contemporary square drive screw has all but replaced the Robertson screw proper and is commonly referred to as a Robertson because it has practically identical drive dimensions and the same colour identification system, but the contemporary square drive socket has parallel sides rather than tapered.

3. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   9.5: 12–14 7 ⁄ 16: 11: 16–18 1 ... has a square-shaped socket in the screw head and a square protrusion on the tool. ... a tool with a corresponding hole to ...

4. Nut (hardware) - Wikipedia

   en.wikipedia.org/wiki/Nut_(hardware)

   The cage has two wings that when compressed allow the cage to be inserted into the square holes Clip-on nut: ... or cover (insertion nut ... 16: 0.1875 4.763 5.18

5. Wrench size - Wikipedia

   en.wikipedia.org/wiki/Wrench_size

   Sizes that may interchange, depending on the precision needed, include 2 mm (close to 5 ⁄ 64 inch (1.98 mm)), 4 mm (close to 5 ⁄ 32 inch (3.97 mm)) and 8 mm (close to 5 ⁄ 16 inch (7.94 mm)). In reality, a wrench with a width across the flats of exactly 15 mm would fit too tightly to use on a bolt with a width across the flats of 15 mm.

6. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   Nominal (thread) sizes range from 0.1875 to 0.375 in (4.763 to 9.525 mm) and lengths from 1.25 to 5 in (32 to 127 mm). Typically an installer uses a hammer drill to make a pilot hole for each concrete screw and a powered impact driver to drive the screw. The drill hole should be 1/2" longer than the depth penetration of the screw.

7. Knockout punch - Wikipedia

   en.wikipedia.org/wiki/Knockout_punch

   A manual knockout punch can handle holes from 0.5 to 1.25 in (13 to 32 mm). The ratchet system has a custom ratcheting wrench that uses a ball screw to make the process faster and easier. This type of system has a mechanical advantage of approximately 220:1 and can punch holes up to 3 in (76 mm) in diameter in 10 gauge mild steel . [ 3 ]