Hi - I'm somewhat new to woodworking and just started buying the tools needed to get some projects done. I don't know if this is a stupid question or not but what type of pipe is better for a pipe clamp. I just picked up a set of Jorgenson half inch pipe clamps and on the packaging it states to use black pipe. I was thinking wouldn't a galvanized be better or does the zinc coating effect the way the clamp jaws work or does it just not matter. Just wondering why they recommend black pipe. If anyone could clue me it that would be great. Thanks