7-Piece M35 Cobalt Left Hand Drill Bit Set for Removing Damaged Bolts and Screws, 5/64-Inch, 7/64-Inch, 5/32-Inch, 1/4-Inch, 19/64-Inch

Got broken bolt out of engine casing now problem.

Worked great for removing a broken bolt. The bits were sharp, cut cleanly, and didn’t wander much once I got started. Definitely made the job easier than I expected. Glad I had this set on hand.

Greatest drill bits I have ever purchased. I had a starter bolt that snapped in the block. The piece was roughly an inch deep into my cast iron diesel engine block. Once these reverse drill bit latched it immediately pulled it out. It did not snap and dull like the previous ones I’ve used. It truly relieve a large headache I had. Highly recommended.

Never Know with Amazon tools. Theses left hand bits cut through German steel like butter. Hoped it would catch and unscrew the broken screw I was working on . Once the pilot was done, a quick enlargement and a easyout finished the job. Bits are functionally sharp, as far as durability, hopefully I won't need them often. I'd buy them again.

Used them to try and remove broken manifold bolts. Turned out to be a one time use. They got dull quicker than I thought but did work for the two bolts.