The Metabo HPT - Hitachi 878226 Sequential Trip Mechanism Set helps provide safe and controlled fastener placement for compatible pneumatic nailers. It works by allowing the tool to fire one fastener at a time in a sequential trigger mode, supporting accurate operation and reducing the risk of accidental double firing. Made to replace a worn or damaged sequential trip mechanism, it he... https://www.wholetoolbox.com/metabo-hpt-hitachi-878226-sequential-trip-mechanism-set/878226.html