The 6400G1 is a 350 Amp plug kit featuring a Grey housing and 67.4mm2 (2/0AWG) contacts (larger contacts pictured here). The SB350 series is rated to 600 Volts and will accept from 53.5mm2 to 152 mm2 wire.
Common uses for the SB350 series include high-current charging and vehicle starting applications. 350 Amp Anderson plug kits are available in grey, blue, black, red, yellow and orange.