E-Z Drill's line of on-grade concrete drills includes two models that drill to a standard 18-in. depth. The Model 210B and Model 210B-2 have been specifically designed for straight-line drilling on a level subgrade and are ideal for lane additions, large patchwork jobs and airport work. The single-gang Model 210B and two-gang Model 210B-2 can operate within 6 in. of a corner. The 210B requires 100 cfm while the 210B-2 requires 200 cfm. Features include quick-release bit guides, a patented roller bearing feed system and safety features such as carriage locks and auto-lock couplers.