A digging bar is a long, straight metal bar used for various purposes, including as a post hole digger, to break up or loosen hard or compacted materials such as soil, rock, concrete and ice or as a lever to move objects. Known by other names depending on locale, structural features and intended purpose such as a hop bar or crowbar in Britain, Australia and New Zealand, and slate bar, shale bar, spud bar, pinch point bar or San Angelo bar in North America, or just a bar. In Hawaii, a similar, traditional wooden device known as an ‘o‘o stick is used as a digging bar in groundbreaking ceremonies. Not to be confused with a curved crowbar, which is designed to provide leverage rather than to dig.[…]
Digging bar/Rock bar — Wikipedia
Vermont Folk Troth 
I defy you to dig a post-hole in NNE without one. I’ll tell you another thing for free. You got a big ass rock in a hole that’s harshing your mellow? depending on the rock you can try drilling a few holes right out straight in a lime with a masonry bit and then use your bar like a chisel and start breaking the rock. Probably best to use a corded drill. Batteried units might not stand up to the abuse, especially if they were affordable.
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