This is a simple yet effective Dual R/C Servo Wire Extension Clip..., Includes 2 slots to slide your R/C servo wires/connectors/shells into once they are connected together, ensures they do not separate when in use, remove by simply pushing your thumb up into the 1/2 circle cutout on the bottom of the clip... two tiny angled outcrops on the sides of each of the clips hold the connectors secure... simple yet effective! ;) Note: The original, single clip version of this can be found here: http://www.thingiverse.com/thing:856549