Harwin Archer M50 Series 1.27mm Jumper Socket Archer M50 series 1.27mm jumper socket or shunt with a closed top design which offers a high reliability multi-usage of up to 300 operations. These Archer M50 series jumper sockets can be manually fitted and provide an alternative to DIP switches as an on-board programming method. The housings of these M50 1.27mm jumpers are made from UL94V-0 black nylon and are end stackable with a 3mm above-board height.