The 621-025-560-013 is a EMI/RFI shielding D-subminiature plug. With two contact rows plug and receptacle in 9, 25 or 37-pin contact sizes pin and contact mating design with PC tail termination. There is a metal shell provides EMI/RFI shielding; Plug shell indents provide grounding and additional mating retention, it also includes grounding features include top or bottom ground plates and four-prong board lock for superior retention to PC board.