You can get chrome steel balls too and they are *very* hard (usually used for ball bearings). You have to drill them with solid carbide drills. I don't think it would be possible to thread the holes using normal taps though.
-Bill [snip] > Very hard steel balls such as carbon or tungsten are ideal for > withstanding multiple lightning strikes without need for inspection and > replacement, but at higher cost. _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
