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No place to work on top of the slab? This unit will allow you to work from the sub-grade and still get the high production you expect at an inexpensive price. The Model 210B-2 will drill a 5/8 - 2 1/2 in. (15.9 mm to 63.5 mm) diameter hole 18 in. (457.2 mm) deep and will require a minimum of 200 CFM (5.6 m3/min) for operation. This unit can be configured to fit in a 4 ft. (1.2 m) opening as needed. The Model 210B-2 is best suited for drilling straight-line applications such as lane additions and airport projects.