Review of Irwin Industrial Tools 11119 Metal Index Spiral Flute Screw Extractors with Left Hand Cobalt Drill Bits Set, 10-Piece

I bought this item after reading several chat room discussions about removing exhaust manifold studs that have broken off in the cylinder head.I'm not sure if it was the fact that the bits were left handed (have to run the drill in reverse) or that they were cobalt coated, or what it was, but, the bit worked great and the extractor backed the stud out with no problem.A couple of notes: 1. I heated the stud with a propane torch and immediately pressed an ordinary household candle to the stud.This causes the melted wax to be sucked into the threads and lubricate them. 2. I did not run the drill at full speed.Patience is a must. 3. I dipped the bit in motor oil for cooling several times during the drilling.This also allows the metal shavings to be pulled out of the hole you are drilling.

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Product Description:
10 Piece Set Includes: 5 Cobalt steel drill bits matched with corresponding screw extractors. Heavy-duty vinyl pouched sets on cards. MADE IN USA.

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