1) Either made from high quality carbon steel or quality better materials.
2) Hardened cutting edges require less resharpening.
3) Large,wide throat design gives excellent chip clearance from deep holes.
4) Quick change shank(1/4")(7/16") fits all standard 1/4"quick change chucks
5) hex shank prevents slipping in drill chuck or bit extension.
6) Capable of boring hard wood with embedded nails
7) Drill spurs have 4 cutting edges for added durability and precise boring
8) Full screw tip allows drill bit to self feed