This is a premium high temp ceramic 5 pin Relay Connector (base) kit w/ terminals and a protective silicone rubber boot. The relay base is designed to work with either high capacity or standard type 12V 4 or 5 pin relays, including the Tyco (Bosch) relays sold here on our site.  The terminals are designed to accommodate 16-12ga wires with ease. This ceramic connector can easily withstand up to 300º C or 572º F, making it nearly indestructible!