Drill point angle gauges, also known as drill point gauges and drill sharpening gauges, are used to gauge the angle of a bit to ensure it's been sharpened to the correct angle. These tools resemble a 6”-long ruler but have a protrusion that is machined to exactly half of the drill point angle so that the point angle of the drill can be confirmed. The rule is usually graduated in fractional inches. They are commonly used in light production and wood working environments.