Core drilling produces a smooth accurate hole through reinforced concrete, brick and most stone.  Hole sizes vary from 13mm Ø to 500mm Ø.  Diamond drilling as it is commonly referred to, is used to create holes for routing cables, plumbing pipes, electrical and HVAC installations.  The process is quiet and efficient with no vibration or dust. Water is used to cool and flush the bit during drilling and can be controlled in sensitive areas.  For creating larger openings, holes are cut next to each other in a process called stitch drilling.