Rugged Rugged Rugged Handy 1/2" drill bit size. Pots or 2 inch poles. When I need big holes, I just wiggle them a little. And due to 2" instead of 3" and 4" it can easily expose rocks in the hole instead of jamming. Sometimes I still got stuck in rocks or branches; The trick is to set the drill to a lower torque so it doesn't twist. Set the speed to high for soft soil and low for hard, rocky soil. My drill has an impact mode. I use it for stubborn knots. For weed control I plant almost parallel to the ground. I noticed that the black paint stripe comes off easily when I first use it when I hit the rocks. Anyway, I don't mind. I just wash and wipe them dry then store them in the shed to avoid moisture which can encourage rust. Overall, it helps me to do my job 10 times faster and easier. There are many uses: tillage, fertilizer mix, parasol hole, etc. Just a note, it's a bit heavy due to the heavy metal. That's about the same weight as 2 or 3 regular hammers. But I like it heavy, it gives stability and strength. Make sure you wear protective rinses against flying debris and install a torque gauge to prevent wist drill. UPDATE: I just did a project for use in very heavy clay soil and it doesn't work because of a design flaw. It works on softer soil, but on this hard clay soil the tip keeps rotating and doesn't bite the soil at all. I would take the one that had a small auger on top so it would cling to the ground and dig in. As for the drill, a regular cordless drill like the Ryobi would be difficult. I'm switching to Ridgid's high end cordless drills and they work great due to the hammering effect and the longevity of the drill.
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