Complete airport projects, full-depth repair jobs and lane additions faster with the 4-gang 210-4 SRA slab rider. You can drill up to four holes 18 inches deep every 12 to 36 inches on center. The machine fits in a 4-foot patch and drills with exceptional accuracy without disturbing the subgrade. It requires 400 cfm and can be configured to tow the air compressor, which eliminates the need for extra vehicles and saves space on the jobsite.