I have have a couple railing jobs for a regular customer & I dont have a punch. I have checked how much to get pre-punched channel or have another shop punch it for me but I would rather do the punching myself. I came across Unipunch which are mainly for use in press brakes but I think they could be used in a shop press. I need a way to punch 1/2" square holes in channel I think this may be the way to go. If anyone knows anything about these punches or another product that could do what I need please comment. I have found all sizes of Unipunch products on e-bay I just don't know which one will work for what I need to do.