These can be made to fit round, square and rectangular material.
 
Rapid V-Bit Tongs are made from 5/16" thick mild steel. The jaws are 2-1/2" long x 1" wide and the reins are 12" long.
 
Includes two Rapid V-Bit Tong blanks (to make one pair), one 1/4" x 1" rivet, and an instructional page.