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).
A hep lock is a small tube that a medical professional inserts into the arm or other site on a patient's body. The tube has a catheter on one end. The healthcare provider administers medication or fluids in an efficient manner through the catheter lock, which works by keeping a vein accessible.