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2. Gimlet (tool) - Wikipedia

   en.wikipedia.org/wiki/Gimlet_(tool)

   A gimlet is a hand tool for drilling small holes, mainly in wood, without splitting. It was defined in Joseph Gwilt's Architecture (1859) as "a piece of steel of a semi-cylindrical form, hollow on one side, having a cross handle at one end and a worm or screw at the other".

3. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   A spade drill bit for metal is a two part bit with a tool holder and an insertable tip, called an insert. The inserts come in various sizes that range from 7 ⁄ 16 to 2.5 inches (11 to 64 mm). The tool holder usually has a coolant passage running through it. [13] They are capable of cutting to a depth of about 10 times the bit diameter.

4. Punch (tool) - Wikipedia

   en.wikipedia.org/wiki/Punch_(tool)

   A center punch forms a large enough dimple to "guide" the tip of the drill. The tip of a center punch has an angle between 60 and 90 degrees. [1] When drilling larger holes, where the drill bit is wider than the indentation produced by a center punch, the drilling of a pilot hole is usually needed.

5. Combination square - Wikipedia

   en.wikipedia.org/wiki/Combination_square

   A combination square is a multi-purpose measuring and marking tool used in metalworking, woodworking, and stonemasonry. It is composed of a rule and one or more interchangeable heads that can be attached to the rule. [1] [2] Other names for the tool include adjustable square, combo square, and sliding square.

6. Square (tool) - Wikipedia

   en.wikipedia.org/wiki/Square_(tool)

   An L-shaped square used in woodworking for checking an inside or outside angle when assembling workpieces, such as boxes. They are designed to be rigid enough to be clamped in place. [17] [18] Set square, or triangle A set square is used in technical drawing, providing a straightedge at a right angle or another particular planar angle to a ...

7. Machine taper - Wikipedia

   en.wikipedia.org/wiki/Machine_taper

   The diameter of the big end in inches is always the taper size divided by 8, the small end is always the taper size divided by 10 and the length is the taper size divided by 2. For example, a Jarno No. 7 measures 0.875" (7/8) across the big end. The small end measures 0.700" (7/10) and the length is 3.5" (7/2).