Repair costs can be reduced when sawing precedes the breakout of an area to be patched. The sawed area results in a neat, easy to patch area, while the jack hammered first area results in a jagged, hard to patch opening. An example were drilling can solve concrete problems can be seen in this application. This particular job required line drilling a series of small holes to provide an opening for air ducts installations. Having a laborer attempt this sort of job with a star drill and hammer would have required a great deal more time than the use of a diamond core drill which was employed. Another instance where diamond coring is illustrated here. Steel sleeves were originally set in unhardened concrete to provide housing for parking meter posts. As the concrete set, the steel sleeves shifted off center and at an angle. Core drilling was called upon to drill perfectly aligned holes over the off center sleeves and remove them.