L-com DJB Series Plastic PCB Jumper Box with DB9 Male/Female This is a custom D-Sub adapter kits for user defined wiring/components The PCB is pre-soldered to connectors - simply solder jumpers through holes in the PCB for the wiring scheme of your choice This product is ideal for null modem, pin reversers, etc. Snap together the ABS non-shielded covers for easy assembly Search L-com DJB Series for more customizable D-Sub PCB adapters; Search L-com DIYW Series for packages of pre-tinned jumper wires for bridging