The tip of the drill bit is larger in diameter than the shaft below so that when the shaft reaches the hole it fits right in.
Which drill bit to use for concrete wall.
As mentioned above the best drill bit for concrete would be the masonry drill bit either tungsten carbide tip or durium tip.
The better drill bit you get the more it will withstand the force you give while drilling.
Otherwise get a 5 32 inch bit for concrete screws that are 3 16 inch in diameter and a 3 16 inch bit for inch screws.
Non concrete bits will take forever to get through concrete if they manage to get through at all.
They are also good for drilling through brick and stone.
Masonry bits cut holes through concrete in two steps.
For bigger jobs though it is recommended that you get the diamond core bit since this type of drill bit is much larger and thicker.
When it comes to solid concrete the sharper the better.
Drill bits with a tungsten carbide tip are the strongest.
Bluegranite turbo carbide hammer drill bit for concrete stone and masonry drilling 25 pack.
Try to get a high quality drill bit because it is always helpful for hard solid objects.
It is very difficult to drill reinforces concrete.
Drilling at a lower speed is more efficient for drilling through concrete.
For concrete you must use bits with spades on each side of the tip.
Be sure to keep spare bits in the correct size on hand as working in masonry can wear out a bit quicker and result in improperly drilled holes.
For metal use the hardest bits at a slow speed keeping the bit cool by squirting some cutting oil at the hole.