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.

Product Details

• Amazon Sales Rank: #6843 in Home Improvement
• Brand: Irwin
• Model: 11119
• Dimensions: .90" h x 6.90" w x 4.50" l,

Features

• 5 fluted screw extractors (size EX-1 through EX-5) with 5 corresponding high-speed left-hand cobalt drill bits
• Use left-hand drill bits in a *reversible drill running in *reverse only
• Comes in metal index/case
• Extractor sizes: EX-1, EX-2, EX-3, EX-4, EX-5
• Weight 1.5 lbs.

From the Manufacturer
Designed for heavy duty drilling applications on hardened bolts and studs

Customer Reviews

Left Handed Cobalt Drill Set
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.

Left Handed Drill Bit
I bought this set to try and extract a rust frozen screw holding my brake rotors on. The idea was to drill in the same direction the screw would need to turn in order to loosen out. Unfortunately I ended up just drilling the screw out and retapping the hole. If you determine that your stubborn screws are really stuck I would suggest just drilling the screw out and retapping the hole. I've had bad luck with craftsman broken screw extracting sets and drill bit extractors. Drill bit extractors are made from harded steel and WILL break if torqued too much, even by hand. It is also impossible to drill out a screw with a broken extractor stuck in it without going to a machine shop = big bucks and time. All in all when it comes to stuck screws I would suggest using a left handed drill bits gradually working your sizes up to eventually drill out the screw hopefully "catching" it in the process and if that doesn't work you can just drill the whole damn thing out and retap it. So purchase a left handed drill bit set and a tapping set. Stay away from broken srew extractors and other gimmick tools. Unless you've personally met someone whose had luck with these. Cause I haven't. I might just sell you mine.