DIYers and construction workers alike use hammer drills to pulverize holes in concrete, marble, brick, granite, and other tough materials that a regular drill cannot get through. These specialized drills come equipped with a hammering mechanism that pounds the drill bit forward, and recurring blows happen in the direction of the hole being drilled. Some hammer drills have the option to turn off the hammer function and act as a regular drill, which you can then use on softer materials such as cutting metal and wood.
Just like with other power tools, hammer drills have electric and pneumatic, or air options. Use an air hammer if you know there is no electricity at your worksite. As long as you have a source of compressed air, you can use the pneumatic tool as much as you need to without charging anything.
Electric drills are divided into 2 options: corded and cordless.
Corded hammer drills:
Rotary hammer drills use electro-pneumatic, or EP, power, which combines air and electricity. Electric power rotates the crank, which moves the drive piston. The compressed air creates a pressurized air cushion between the pistons.