I have to drill to put on my nerf bars. I think cobalt is the best to get bit wise to do this in metal? What kind of bits do you guys use (brand/type) and recommend? I want something that'll work without the bit dulling or shattering within a few minutes of starting. I'd hate to drop $15 on a bit only to have it turn out to be a waste of money....thanks in advanced!! :-) "I love the sound rice burners make when ya run over them"