casting four rings at the four ends of the net in order to set the bars, so as to carry it
Other versions
King James Version
And he cast four rings for the four ends of the grate of brass, to be places for the staves.English Standard Version
He cast four rings on the four corners of the bronze grating as holders for the poles.New International Version
They cast bronze rings to hold the poles for the four corners of the bronze grating.