Following are examples of three metamorphic rocks and a list of their uses. Marble is a metamorphic rock that is used to make floor tiles, counter tops and it is carved into statues and was used extensively in the building of the Roman Colosseum and other historic buildings. Slate is another metamâ¦.
A hex key, Allen key or Allen wrench is a tool of hexagonal cross-section used to drive bolts and screws that have a hexagonal socket in the head (internal-wrenching hexagon drive).
The Num Lock key is included on some computer keyboards to change the functionality of the number keys, enabling more functions and shortcuts to be built into the keyboard. In the same way that Caps Lock turns all letters into capitals, Num Lock switches on or off the secondary function of the number pad keys.