Equipotential bonding rail, with mounting holes Ø 4 mm. Dimensions (approx. dimensions) H x W x L : 12 x 12 x 58 mm Connection options : 1 x 6 -25 mm² 5 x 1, 5 - 6 mm² with 2 terminal points per connection Housing material : nickel-plated brass Cylinder head screw material : galvanized steel