Genuine Anderson Powerpole connector set, includes Red and Black Housings and 2 - 15 Amp Contacts.  These contacts are for 16 - 20 gauge wire.

These Powerpole connectors come in one housing size that accomodates three different wire ranges.  All contacts are rated at 45 Amps. 

The 15 Amp contact indicates a wire range from 16 - 20 AWG. 

The 30 Amp contact indicates a wire range from 12 - 16 AWG. 

The 45 Amp contact indicates a wire range from 10 - 14 AWG.

This allows for interchangeability between all three sizes of contacts and suggests a general current range.

MADE IN THE USA

They also come as a Pre-bonded pair of Red/Black housings.  These are in the ARES/RACES standard configuration.