I just mounted a Smittybilt M1 bumper on my 2014 Iceberg FJC. All is good, but wanting to mount my 23" light bar to the bumper above my winch. I have everything I need to mount but need to drill a couple of holes in the bumper which is 3/16 cold rolled steel. Any suggestion on what tools to use to get the job done? I've gotten a couple of ideas on drill bit to use, but thought someone in the community may have already done this or has a better idea.