Hello -
What's the best bit for drilling through Steel? I'm drilling through a S-Steel pedastal base - about a 5/16" hole.
thank you - erik

I have used cobalt, but what ever you use, drill slow.

the best way is a shap bit ant to pulse the bit on and off a slow speeds and you go right threw.

Thanks guys. Basically I need to bore out a 3/16 hole to a 5/16 hole. I appreciate the help.

i dont know about you guys but i normally spray wd-40 to cool the drill bits and the s steel when drillin. its help drill bits last longer that if ur going to use it oftens..

Cobolt, go slow, and keep it very well lubed.

Dip the bit in a small container of oil to cool it off and to lubricate the area you're cutting. WD 40 seems like an expensive way to go.