They are relatively simple to make with a drill press and a band saw. It started as a 2.5'' x .25'' x 36'' silver plated copper bar. The reason for the welds is so that the bolts do not turn. It is designed to comfortably join 20 runs of 1/0 gauge wire together. Because so much pressure can be applied to the wire from the copper through the bolts this design works very well for high conductivity.
