Description says uses 18v cordless drill I had 20v and most failed but for mostly I could work with it small part. I still had to make multiple moves back and forth for each hole. Maybe a cordless screwdriver worked better? The drills aren't fancy, you need a softer soil and more power/torque from your planter. It rained early which helped. I made holes to fertilize all my trees and it would be cumbersome to pull an extension. To be fair any other brand of drill would give the same results.
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