Di-Log-MC4-Type-4-Solar-Spanners-SL906-Di-Log-SL906-P-The-Di-log-SL906-MC4-Type-4-Solar-Spanner-set-consists-of-two-spanners-required-to-tighten-the-two-parts-of-the-MC4-connectors-the-spanners-slip-once-the-correct-tension-is-achieved-preventing-the-connectors-from-being-over-tightened-nbsp-The-end-of-the-spanner-is-designed-to-be-used-for-disconnecting-a-pair-of-coupled-connectors-They-are-designed-for-tightening-MC4-connectors-commonly-found-on-PV-systems-They-significant