Core Drilling 

Core drilling, used when a precision, circular cut is needed, is one of the most cost effective ways to create openings for pipe and conduit up to 54 inches in diameter. Holes of almost any diameter, and virtually any depth and length, are easily drilled to make openings for plumbing, electrical HVAC, and other installations. A core drill bit consists of a steel tube with diamond segments brazed or laser welded on the drilling end. The core bits are mounted on the rotating shaft of various types of drilling machines. Core drills can be operated vertically and horizontally and hydraulic drill motors may even be operated under water.