"But with a drill, you can bore under yards, driveways and streets without hampering residents from getting in and out of their homes." HDD is also a good choice - and sometimes the only choice ...

So, how do you know if purchasing a used drill rig is a good idea for your operation? "Used units can be a good fit for a contractor who does an occasional bore," says Klane Kirby, Astec Underground.

Drills with a percussive action are typically used in hard materials, such as masonry units or rocks. Drilling rigs are used to bore holes in the earth to obtain oil or water. Oil wells, water wells, ...