That is some truly hard steel, requiring 3 bits (titanium coated) to get through at 1/16th. I broke 3 bits. Wow, what a vape though. Using Axioms Banana Cloud Rat and Gremlins Vanilla Custard, the flavor really comes through. The vape quantity is just ridiculous. Topping an h-cigar nemesis, I couldn't ask for much more. Both of these vendors make great juice that is best brought out with an rba. I've tried several configurations on the Igo as well as a Nimbus and I just can't do better than dual micros of about 6 wraps of 28g for .5-.6 ohms. All of these newfangled builds are interesting but a traditional dual micro works best for me.