An expansive auger bit has an adjustable cutter, for boring holes of different diameters. A scale on the cutter blade indicates the diameter of the hole to be bored. It is a must-have for a woodworker who is required to drill an odd size diameter hole.
The drill bits are made from Titanium nitride coated HSS (hi-speed steel). The drill bits are fully precision ground at 135° with a split point. The drill bits can also be used to drill either wood or metal.