Surface Technologies 01E618 29-Piece Round Shank Jobber's Length SST+ Drill Bit Set, Orange

Forets de qualité supérieure je recommande sans hésiter

Finally, I have found a quality set of bits. These babies are sharp, and stay that way a long time. I love good quality tools.

Excellent drill bits. I drilled through stainless with no problem. I did not have lube, but the bit did not burn.

Attention ça coupe ! Avec ça t’es prêt à percer plein de beau ptits trous !

I received these in a timely manner and arrived just as pictured in Amazon. These are meant to replace a set of cheapies and a set of irwin hss. The first thing i tried these on was broken leaf spring along side the others. the cheapies drilled into the leaf spring about 1/16 of an inch and the stopped. the irwins hss drill 3/32 into the spring and stopped drilling. and the walter pulled itself all the way through the spring. then i tried a couple other walter sizes and the same result. then we had a broken alternator bolt in a bracket housing that needed a 1 and 1/4 inch section of bolt drilled out for a easy out. again i tried the others and they failed. tried the walter bits and it was no problem. i used the same coolant on all the bits and drilled at a moderate speed. i will post more as i use them . Update: ok so I used this set in a small automotive shop for 1 1/2 years and every time i used them it was always with slow to moderate speed with cutting oil. I never spun the drill too fast, just enough that nice large shavings were produced. Most of the time they were used to drill out broken bolts and I never suffered a snapped bit which I was warned about with these. In that time I never had to sharpen the bits. When the owner ordered another set of bits I stopped using this set. I am very happy with this set. Please click helpful if this was of use to you.