How do you dig a deep but narrow hole? In many cases, a shovel or spade will widen a hole when you try to make it deeper. A posthole digger, in this case, is needed to give you the hole you need for putting in fence posts or planting. Our selection includes various posthole diggers by Fiskars and Bully Tools that go five to 6.5 inches into the soil. Aside from this type of tool, we carry various digging bars and specialty tools with a similar purpose. This includes edgers and root cutters to help you with difficult landscaping jobs, planting augers, and standup planting tools.