I went up to Denver last weekend to a big car parts exibition at the stock show complex up there. I ended up buying a carbide burr for $8 that looked to have a 1/4" shaft for my die grinder. Should be great for removing the booger welds on an inside corner that happen when I forget to turn the gas on :). Well, I got her home and the shaft is just a little too big for the die grinder. I'll probably have to grind down the shaft on it to get it to fit. What the heck is going on here? Did I buy some metric deal or something? The shaft is smooth and doesnt appear to be for a milling machine, but who knows?