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).
1. Sunk Keys :- The sunk keys are provided half in the keyway of the shaft and half in the keyway of hub or boss of the pulley. The sunk keys are following types: 1) Rectangular sunk key 2) Square sunk key 3) Parallel sunk key 4) Gib-head key 5) Feather key 6) Woodruff key 5. Rectangular Sunk key Square Sunk key 6.