Drilling & Grooving Core Drilling Core Drilling Grooving The core drilling machine is the most widely recognized and adaptable tool in the concrete sawing and driling industry. Through years of innovative expertise the professional has diversified the use of this tool to maximize quality in normal applications. Special-made machines have the capability of driling thirty-six inch diameter holes both above ground or underwater. The Safety Groover has proven its value over the years on highway and in commercial use for reducing accidents on slippery concrete or asphalt surfaces. Multiple diamond blades are used for cutting grooves in concrete for safety of people, livestock, automobiles and airplanes.