The Metabo HPT - Hitachi 878226 Sequential Trip Mechanism Set is a fastening tool component set that supports the sequential trigger operation of compatible nailers. The mechanism coordinates trigger activation with the tool’s contact element to help control when a fastener is driven. This operating sequence supports deliberate fastening and helps reduce unintended firing during norma... https://www.wholetoolbox.com/metabo-hpt-hitachi-878226-sequential-trip-mechanism-set/878226.html