This item fits all 3 Rimba power boxes (7850/7880/7890). When using both clamps at the same time, this item is Bi-Polar. Each individual terminal is uni-polar. The cable splits into a + and a -, so each terminal separately is uni-polar. Warning: never put two plugs in 1 terminal at the same time, to avoid a short circuit. Material Iron Size: 4 x 6.6 cm Color: Silver