The spud bar is around 6 feet in length. It is usually made of forged steel that is one inch in diameter, although there are some made of Fiberglas. One end is flattened and sharpened into a chisel, and the other end is a flattened knob to use as a tamper. When made of steel, it weighs around 15 lbs.
One digging bar by Seymour Manufacturing features a chisel on one end and a point on the other. Great Britain's digging bars have narrow unsharpened chisels with a simple point at the other end. They may also be thicker in diameter than those used in North America.
Spud bars are used to break up heavy clay soil and dig through roots and rocks when clearing an area for a garden or fence. Many farmers use them to make preliminary holes for posts in fence building. They are also used by ice fishermen to test ice depth.