CHANCE Terminal, Block 4-Way, 4-Way Grade 5H 4-Way Terminal Block for 5⁄8-11 UNC Threaded Ferrules. Designed and tested to ASTM F855 Grade 5H asymetrical ultimate rating of 47kA with X/R=30. Attach ground leads form grounding clamps to a common ground. For four threaded 5/8in.-11 ferrules. Made from a bronze alloy.