In addition, the bits are coated with titanium ensuring longer durability by protecting against rust. The countersink drill bill set comes with three pieces of countersink bits compatible with ...

Tungsten-carbide tipped (TCT) and titanium nitride coated (TiN) drill bits are also popular. HSS is hard-wearing, but other materials can be added to make the drill bits harder and longer-lasting.

If you're in the market for drill bits specifically from Harbor ... sometimes being coated in other materials like titanium nitride for added durability. Meanwhile, cobalt can handle slightly ...