Center Rock Reverse Circulation Low Profile DrillsDrilling hard rock without creating dust or a large debris field can be a challenge! With Center Rock's Reverse Circulation Low Profile (LP) Drills, it can be done without sacrificing production. Our advanced engineering provides a cost effective solution for drilling hard rock, up to 120-inches in diameter. Some of the nation's largest building, roadway and mining contractors use our drills to quickly drill the exact size and depth required. See for details.