[LPoole]

Try to find some tungsten drill bits. Pretty hard without being near as brittle as carbide bits. A lot cheaper too. A pilot hole is a must. And use cutting fluid, not wd40 or 3in1 oil. Slow s-l-o-w drill speeds. Buy a few bits of each size hole you are gonna drill. Once that hard metal dulls the bit and you stop seeing shavings its time for a new, sharp bit (you can also sharpen the used bits with a bench grinder or belt sander). Best of luck to ya.