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2. Hex key - Wikipedia

   en.wikipedia.org/wiki/Hex_key

   Hex keys of various sizes with ball ends. Tamper-resistant hex screws have a protruding pin in the center of the hex recess that prevents insertion of standard hex keys; as such, they can only be fastened and removed with a special key that has a recess for the pin. A similar "center pin reject" security feature is also used on torx screws.

3. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   A security hex screw drive features an extruded pin to make the fastener more tamper resistant by inserting a pin in the center of the female socket, requiring a tool with a corresponding hole to drive the fastener. This can also prevent attempts at turning the screw with a small flat-bladed screwdriver.

4. Automatic center punch - Wikipedia

   en.wikipedia.org/wiki/Automatic_center_punch

   The automatic center punch mechanism has been used for a wide variety of other applications. These include Marking and starting a hole for drilling without the bit "walking" out of alignment; Letter stamp sets; Glass-breaking tools used in rescue work and a common tool for a car thief. Impact tool for hardness testing [21]

5. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   An ASME B18.2.1 compliant cap screw has somewhat tighter tolerances than a hex bolt for the head height and the shank length. The nature of the tolerance difference allows an ASME B18.2.1 hex cap screw to always fit where a hex bolt is installed but a hex bolt could be slightly too large to be used where a hex cap screw is designed in.

6. Punch (tool) - Wikipedia

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

   Center punch. A center punch is used to mark the center of a point. It is usually used to mark the center of a hole when drilling holes. A drill has the tendency to "wander" if it does not start in a recess. 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 ...

7. Allen (brand) - Wikipedia

   en.wikipedia.org/wiki/Allen_(brand)

   In January 2017, Apex Tool Group announced they would end the manufacturing of Allen and Armstrong hand tools in their Sumter, South Carolina manufacturing plant. With this, Apex Communications Director Kelly Rhoads confirmed the line would cease production on March 31. This ended production of the Allen brand in hex keys, L-key, and T-handle ...