EC3 male battery side connector pair.  Rated for up to 60 amps of current.  Great quality item in a handy 2 pack.  Perfect for match for Horizon Hobby battery packs e-Flite Blade Pro Boat Dynamite Reaction Losi Park Zone.  Solder conductor to wire 1st and insert into the back side of the plastic housing!  You get 2 plastic housings and 4 male gold plated conductors.