... electrical connectors, J7W is sealing type, with GJB176A-86 standard terminal blocks,Rectangular connectors J7,military connectors J7 series of products ... , Insulator: Heat-resistant thermo plastic materialsShell plating: Electrolee nickelContacts: Copper alloy, gold platedRubber pieces: Silicone rubber materialsMechanical life: 500 cycles terminal blocks