5 Best Concrete Drill Bits Review 2021 | Masonry,
2021-1-12 · There is a small groove, and then there is a bigger groove. The smaller one helps to hook the bit into the chuck firmly, while the bigger grooves allow a bit more room to the bit while they are within the chuck. The combination of these grooves makes the bits capable of handling greater torque and hammer strength. 3.
Get Price