NOTE:
561 series Staples also fit carton stapler by Carton Closing Corp.
"Red Line" series, all Container Stapling Corp. "King Size" series
Staplers, Duo-Fast DF-FC6C, DF-PC6C, DF-HC7C, and DF-AC8C Staplers,
all DWS (Acme) Top Stapling Machines, and all International
Stapling Machine "C" series Staplers.