Ok, this is killing me. I got 4 NEW coblat bits. They are RIGID brand and are the same brand I bought the first time that got one hole in the blade. None of these would even cut into the blade!!!!! It says its a cobalt bit on the package and I went SLOW as possible. Is there something I am doing wrong here?? That 8 bits I have bought and wasted now, I think thats up to about $25 just in bits!! LOL