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<blockquote data-quote="NDbowman" data-source="post: 477267" data-attributes="member: 1525">Bosch cobalt bits are what I use. Used to be $16 bucks a set, now closer to $40. Work really well on steel. I had a fencing project where I used drill stem for posts and wanted to hang 3/4&quot; sucker rod but didn't want to weld the clips to hang the sucker rod in case I had to take it all down. So I bought 4 bosch cobalt bits the size I needed and started drill holes in the drill stem posts. 8 holes per post with a milwaukee m18 drill. I was curious how many holes I'd get before I dulled the bit. I didn't use oil or cutting fluid, didn't drill slow, went as fast as the drill would go and would just stop a few seconds to let bit cool a bit before drilling again. Never did dull a bit, got well over 100 holes, I'd snap a bit long before I dulled them. I think I was on my third bit when I finished and still use that bit.The only thing that will dull them is just drilling high speed without stopping to cool it, it'll just burn the tip off in no time. The other thing I drilled a hole in that dulled a bit was an old piece of angle iron from a bed frame. I expected it to be cheap soft steel, It wasn't, it was some super hard stuff that I couldn't believe, harder than drill stem thats for sure.[MEDIA=amazon]B07Q9HNTBH[/MEDIA]</blockquote>

[QUOTE="NDbowman, post: 477267, member: 1525"] Bosch cobalt bits are what I use. Used to be $16 bucks a set, now closer to $40. Work really well on steel. I had a fencing project where I used drill stem for posts and wanted to hang 3/4" sucker rod but didn't want to weld the clips to hang the sucker rod in case I had to take it all down. So I bought 4 bosch cobalt bits the size I needed and started drill holes in the drill stem posts. 8 holes per post with a milwaukee m18 drill. I was curious how many holes I'd get before I dulled the bit. I didn't use oil or cutting fluid, didn't drill slow, went as fast as the drill would go and would just stop a few seconds to let bit cool a bit before drilling again. Never did dull a bit, got well over 100 holes, I'd snap a bit long before I dulled them. I think I was on my third bit when I finished and still use that bit. The only thing that will dull them is just drilling high speed without stopping to cool it, it'll just burn the tip off in no time. The other thing I drilled a hole in that dulled a bit was an old piece of angle iron from a bed frame. I expected it to be cheap soft steel, It wasn't, it was some super hard stuff that I couldn't believe, harder than drill stem thats for sure. [MEDIA=amazon]B07Q9HNTBH[/MEDIA] [/QUOTE]

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