Ideal for connecting identical and unequal conductor cross-sections. For connecting different conductor types and materials in accordance with VDE 0295 Class 1 and 2 and Al conductors in accordance with DIN 48201 Part 5. With inspection hole for checking cable insertion (different materials must not touch). Special groove profile inside to destroy the oxidation layer when screwing. Version with 4 screws. Clamp body: high-strength aluminum alloy.