750A make, 100A break, 10sec On, 20min Off Contacts: Copper. Terminals: Copper. Small ignition and ground terminals are 10-32 thread. Large contact terminals are 5/16" -24 thread. Hexnuts and lockwashers are included. Bracket mounting holes 5/16 x 19/32,” 2 13/64" on centers (7.9 x 15.1, 56.0mm) Plated steel housing, Clear protective coating protects steel body.