05.563.8053.0 is the product number of a Wieland relay socket. It is designed to be used with Wieland's 0561,0562, and 0566 model plug-in relays. The relay socket has a 14-pin plug-in base, with a keyed connector designed to ensure that the connected relay remains secure. The socket has a durable plastic housing, designed to resist corrosion and other environmental degradation.