Cobalt Left Hand Drill Bit Set, 13Pcs M35 High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic, with Index Storage Case, 1/16"-1/4"

I saw some of the one star reviews that said these will barely drill though steel. I tried one out on an old steel industrial bumper jack. It cut fine with a hand drill.Of course they are going to be more brittle than regular HSS. They are M35 cobalt alloy.EDIT: I notice that some of the reviews here are for a different set of bits than I got. Mine is the 13 bit set in the plastic clamshell index box

Product is a steal at 120$ given the hardness of the bits and the vast selection you get with the 115 or so bits that come with it.The case may arrive with a busted brass rivet or bent case like mine, but all the bits were still held in place with the Styrofoam which is more important for those small bits that are unlabeled.If the rivet is broken, it's pretty easy to just pop in a new one from aluminum or steel rivets I had on hand.The bent sheet metal case? It's thin stuff so it was easy to bend straight by hand.My biggest issue is that a few of the bits I used (#44 size specifically) didn't run true in the drill press. But runout wasn't so big of an issue as I just used a starter drill bit and then chased that with the #44 drill bit.Performance-wise though, hard to beat. The bits cut like butter through mild steel and they don't shatter easily like those cheaper titanium plated drill bits. In the end, worth every penny.Also, the 8 or 9 bits I measured with a micrometer were indeed true in size. Very pleased with my new set and worth the money 💰

Had an issue with using the bits. The seller was very helpful and demonstrated great customer service.

I’m always leery when I buy drillbits because so many on the market are cheap and they break and they’re not sharp and they don’t last,.So I took a chance on these drillbits because I was not familiar with the manufacturer and I needed them for my business. They are in a nice metal case and these things cut through metal like they were going through wood and I’m very happy with them

Drills are satisfactory. The case is not good quality. The drill size markings in the case are not visible for the drills in the back rows. The latch on the case lid is thin plastic that really poor design and quantity. In summary, typical Chinese inferior product. Would have preferred a different drill index.

The people that gave bad reviews clearly should never hold a drill! These are the people that need helmets for daily protection. I used these to drill grade 8 bolts and it chewed through them.

I purchased these bits to use in a small drill press to drill holes in hard drive cases and disks I was getting rid of. They worked perfectly and did the job. Some drives have a fairly decent metal case and can be hard to get through with conventional bits but these worked great for this use case.

Good value for a drill bit set. All bits are straight. Used several in the shop and they hold up and stay sharp even in SST drilling.

Bastante satisfecho con la duración, es similar a las brocas Milwaukee titanio pero a un precio menor para ser de cobalto esperaba que duraran un poco más pero aun así muy satisfecho

Works well

Nothing