There are three tool options to consider when drilling large-diameter holes in thick steel: twist drill bits ... carbide-tipped hole saws can drill through metal that is up to 5/8" thick.
7don MSN
Diamond-edged drill bits tackle the precision job of cutting 150-foot vertical cores, making room for cables that will bind together seismic enhancements in the foundation and towers.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback