Thumb screws are commonly used in various contexts, such as:

1.   Computer Hardware: Thumb screws are often used to secure panels, covers, and components in computer cases. This allows for easy access to the interior of the case without the need for tools.

2.   Electronics: They can be found in electronics equipment and devices where quick access to internal components is necessary, like in certain types of enclosures.

3.   Photography Equipment: Many camera tripods and accessories use thumb screws to secure components and make adjustments.

4.   Furniture: Some furniture items, such as bookshelves or stands, might use thumb screws for assembly, making it easier to disassemble or adjust the furniture without using tools.

5.   Optics and Instruments: In some cases, thumb screws are used to hold lenses, mirrors, or other optical components in place within scientific instruments or devices.

6.   DIY Projects: Thumb screws can be used in various DIY projects where frequent adjustments or quick assembly/disassembly are desired.

7.   Computer Hardware: Thumb screws are often used to secure panels, covers, and components in computer cases. This allows for easy access to the interior of the case without the need for tools.

It's worth noting that while thumb screws are convenient for certain applications, they might not provide the same level of tightness or security as screws that are tightened with tools. Therefore, they are most suitable for situations where ease of access and adjustments take precedence over extreme security or torque. 

Thumb screws are a type of screw designed to be tightened and loosened by hand without the need for additional tools such as screwdrivers or wrenches. They typically have a large, knurled or ridged head that can be easily gripped and turned using your thumb and fingers. This design makes them convenient for applications where frequent adjustments or removal of screws are required, especially in cases where using tools might be impractical or time-consuming.