Auger bits are produced in metric sizes ranging from 6mm to 25mm and imperial widths ranging from 1/4″ to 1″.
Compared to other types of drill bit, auger bits can be considered to be quite long. The shortest auger bit commonly found is 200mm (8″) long. The longest is 600mm, which equates to 24″ or 2 feet! These can easily be used to drill through wall studs, tree stumps or thick pieces of timber.
Earth and ice auger bits are even larger. Average bits of this type are usually at least 150mm (6″) in diameter and 800mm (31″) long.
Like many other types of drill bit, auger bits are available in ‘stubby’ form, with overall bit lengths of 100-120mm (4-4¾”). These short bits are useful for drilling holes in more confined places, e.g. making holes in roof joists.