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Message: <blockquote data-quote="A.G." data-source="post: 28132" data-attributes="member: 71"><p>I would get the model 30 for more torque, drilling through rocky soil. Especially if you have bigger holes to drill like 24s for example. With the high flow option you could probably run the drive in high flow in more moderate or easy digging conditions, and drill a little faster like a 15 model. Rock bits while expensive, are the way to go, whatever drive you end up using. I use a model 15 to drill 18 inch holes through stone, but you have to be carefull not to press down too hard or the drive can stall. You just want to keep the rock bit grinding away, its digging just not real fast. Best option, rent one before you buy, so you can really test it.</p></blockquote><p></p>