The 971-037-020R121 is a 37-position D-Sub backshell kit from the 971 series. It is constructed from ABS plastic with a nickel-over-copper metalized finish, providing effective EMI/RFI shielding. This kit includes two backshell halves, two 4-40 thumbscrews, housing screws, and a compression ring system, accommodating a maximum cable diameter of 13.00mm. The component is designed to operate reliably in a temperature range of -30°C to +90°C. As a complete, RoHS compliant kit, it offers a robust solution for cable termination and strain relief in various electronic applications.