Waterjet cut circular hole on the side of a steel square tube, and cut off the tube. Video showing high pressure water jet first piercing a stating
all through the wall of the tube, then cut a hole of about 1 inch diameter. Then the same is done on the opposite side of the tube.
“FD Grip” The No.1 earthquake-resistant rebar coupler in Japan, the highest seismic country,
for over 30 years.