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E-Z Drill’s Model 240B SRA combo drill system combines the standard features of the Model 210B SRA with the capability of converting to a pneumatic core drill, the Model 240B SRA caters to both rock drilling and core drilling applications ” eliminating the need for a separate drill system. The conversion process requires just a few simple tools and can be quickly conducted while on the jobsite. Featuring totally pneumatic operation, the core drill utilizes a three-speed motor (400, 900 and 1,600 rpm) and requires a minimum of 77 CFM for operation, whereas the standard rock drill configuration requires 100 CFM. The unit can core and drill holes from 5/8-inch diameter up to 2-1/2 inches, and drill up to 18 inches deep.