Craftsman  29 pc. Cobalt Drill Bit Set

One uses cobalt bits mainly to drill in metals - especially ferrous metals such as steel or iron. You can use it to drill other materials also such as wood, plastic, and non-ferrous metals such as brass and aluminum. I was pleased with the quality for the cost I paid for these bits. I have used them for general pulse use as well as drilling steel and cast iron. Cast iron is very hard and can be hard on drill bits. Be sure to use lubrication when drilling metals - especially steel and cast iron. By the way WD-40 is great for non-ferrous metals, and light machine oil is best for steel or iron. It helps protect the bit from premature wear out. I did eventually dull the 9/64 bit on cast iron - but I had failed to provide lubrication and drilled several holes in cast iron. On the whole I am pleased with these bits.

I needed to drill out a 3/8 inch broken muffler bolt. It took the use of at least 8 drill bits, starting small and progressing upward, to accomplish this! Even though I was using cutting oil liberally, the larger bits would stop cutting after a very short period and were useless. They even spun in my Dewalt drill because of the smooth shank. The cobalt coating is only microns thick and burns right off leaving you with a dull, soft-steel drill bit and a cute box for your $100 bucks! Tomorrow, Sears gets them back and they should be taken off the shelf.

I had bought a set at a hardware box store and broke 2 bits with in 1 minute. went to sears and drilled out 32 screws from a 60 year old wooded butchers block you can not tell which drill bit I used !!!!!! I used to be a machinist in a former life these are the BEST bits ever.

I'm an auto mechanic. I bought this set for mostly removing broken bolts. So far it has been doing great jobs without breaking any sizes. Just before I bought it, I broke a crankshaft pulley bolt at work. I needed to rush to Sears and pick up the best one in the store. I was easy to make a hole in the broken bolt. I thought I would break a few bits but I broke none. Not only the pulley bolt, I also used for broken exhaust bolt and the job was successful. The only thing I am worried about is they don't have individual replacements just as other reviews said. But I have used them many times and haven't broken any yet. So I hope and believe it won't happen so soon.

i went yesterday to sears and bought just the cae alone the item number is 66852 and its the very best drill bit case thst craftsman has to offer i feel if you dont have this and all of your drill bits are lose and all over the place this is the case you should have in your inventory of tools as i call it my arsenal of tools its a very strong metal case and holds a lot of bits so make sure that you have this case in your tool chest and your portable tool box never be without it as i always say its a major must to have for anyone who works hard and does a great days wood working or any other type of drilling ......steve

These drill bits are by far the best I have had so far. They work great on all material such as steel, aluminum, brass, plastic and rubber. You will want to be very careful with these though, as the Cobalt bits are not sold separately. I dont know about you but I anal about my tools and if 1 drill bit is missing from the case, its all over!

Drilling 1/2 inch steel plate (mild steel) in a drill press (also craftsman) and the bits would chip and a few snapped right in half. High price and low performance. Used some cheap Irwin bits and they did the job for a third of the price. Shame on Sears.

More than have these bits have broke in half. Sharp and cut well, but a little snag and snap!

Unless your doing soft wood, steer clear.

This drill bit set has replaced a whole drawer full for mis-matched bits.  I have used them in both the drill press and the handheld drill.  I've been impressed by their ability to keep an edge and the sizes this set offers have served every need I'[ve had so far.  i use them in wood, soft metals and even hard metals.  Like all precision bits a little every care should be taken not to over-heat them, but with a little common sense you'll enjoy this set for years.

Let me first say I am happy with the bits themselves, I am derementing stars only for the way the store treated me.  I purchased these online and went into the store to pick them up.  When the guy handed them to me, the case had been severly beaten and in really bad shape.  If it was a minor thing, I would have overlooked it, but it was in rough shape.  I am talking about the metal case that houses the bits, not the plastic wrapper/cellophone.  However, the bits themselves inside the case seemed fine.  I happened to need tham that day so I took them.  Oustide of needing to buy another cheap set to obtain a case to hold these nice bits, I am happy with the purchase.  I am quite unhappy with Sears itself though for being completely happy selling a product as new that was obviously beat up badly.