The Power Planter One-Gallon Pot & Post Hole Auger features an all-steel construction. They wrap the 1-1/4-inch shaft with a 10-gauge flighting. This tool measures 7 inches in diameter and 28 inches in length. This tool is perfect for planting one-gallon potted plants or shrubs. It also works exceptionally well for digging 4 x 4 post holes. It leaves enough room to pour cement around the post for anchoring. Power Planter recommends using a gas powerhead with this auger. You can also use a large electric drill with a side handle. Professionals choose Power Planter for planting solutions. This durable auger will provide you with years of dependable service.