Engaging Tools: A utility terminology for a type of tool used to "engage" a stone, brick or other object and remove the top surface, or otherwise alter its shape by cleaving. Various types of tools can be used. Examples are hammers, chisels, axes, and cleavers. These are generally used in construction and other work involving movement of heavy objects and the like, such as quarrying or digging.
The most common is the Hammers, which has a shaft with teeth on one end that pushes at the other end of the tool, which in turn removes and cuts the material at the other end. The use of this type of tool dates back to ancient times, and is still in use today. Another name for this tool is "stone breaker", because of its similarity to the hammer. Today, there are different styles available such as electric driven tools, fixed blades and pneumatic driven tools. The type you decide will depend upon your needs.
Grounded tools are also available in hydraulic presses, which are operated by water or an electrical motor, and are usually either manually or electronically operated. There are models made in Japan and Germany, as well as the USA, but the ones available in the US tend to be gas powered. These will not move much if you are dealing with very large stones or other sizes. Most of these tools are portable, lightweight and easy to use.