Drill bit

A drill bit comprising:

• a drilling head at a forward end of the drill bit;
• a shank at a rearward end of the drill bit and configured to be driven by a power tool;
• and
• a helical conveying portion extending between the drilling head and the shank and having a changeover portion, a pre-changeover portion between the drilling head and the changeover portion, and a post-changeover portion between the changeover portion and the shank, the helical conveying portion including a first helical flute, a second helical flute, a third helical flute, and a fourth helical flute separated by a first helical web, a second helical web, a third helical web, and a fourth helical web,
• wherein, in the pre-changeover portion, the flutes have a constant pre-changeover pitch, the first web and the third web each have a first pre-changeover web width, and the second web and the fourth web each have a second pre-changeover web width, and in the post-changeover portion the flutes have a post-changeover pitch, the first web and the third web each have a first post-changeover web width, and the second web and the fourth web each have a second post-changeover web width, and
• wherein the post-changeover pitch is greater than the pre-changeover pitch, the first post-changeover web width is less than the first pre-changeover web width, and the second post-changeover web width is greater than the second pre-changeover web width, and
• wherein, in the changeover portion, the flutes have a changeover pitch that gradually increases from the pre-changeover pitch to the post-changeover pitch, the first web and the third web have a first changeover web width that gradually decreases from the first pre-changeover web width to the first post-changeover width, and the second web and the fourth web have a second changeover web width that gradually increases from the second pre-changeover web width to the second post-changeover web width.