Du-Bro Threaded Couplers 2mm Part No: 695. Designed for use with Du-Bro Kwik-Links and ball links. One end has no threads and can be soldered on and the other side has either 2-56 or 2MM threads. 2mm Threaded Couplers are used with Du-Bro`s 2mm Nylon Kwik-Links & can also be soldered on Du-Bro`s 2 mm push-rods. The coupler length for this part is 1 1/4 "(31.7 mm).