These IRWIN drill bits have an adjustable cutting blade to bore a variety of hole sizes
Each wood drill bit has a micro-dial screw that can be turned to the desired boring diameter
This drill bit cuts 35 standard hole sizes in 1/16-inch increments
Bits have a taper square shank for use in a hand brace
8-1/8" overall length and 7/8" to 3" diameter
One-piece drop forged construction
For general purpose boring in all types of wood where a variety of larger size holes are required
Excellent for installing locks, roughing holes for pipe, school shop projects, and similar work
Wedge type blade lock and medium-slow screw point