This is the thicker one for planting bedding plants. This one can drill a 2 3/4 inch hole but can also be used to widen it to 3 inches. This drill mounted bulb auger is 28" in length makes this a real back saver. Because it is long you don't have to hunch over to dig your holes. Easily dig through varying soil types even clay or soil with small rocks. Plant bulbs faster than ever. You will need a drill with a regular chuck for this item, does not work in quick change drill chucks.