Review on Jobber Carbide Tipped Standard 50360 by Ashwin Chauhan

Looked good quality when received, came in its own tube and had cosmoline (?) or some sort of wax to protect the tip. Allegedly made in the USA. I used it to drill holes in the bottom of the car's cast iron intake manifold to use long #7 3/8" screws to attach the oil slinger. It broke on the 5th hole so I had to try later to remove the hardened steel piece from the cast iron. Not easy. Very disappointing.