Came across these on Car Builder Solutions this week. Essentially they are a mini common cable connector. They come in three and five gang. All you do is strip the end, lift the arm, push the cable in and snap the arm shut. Neat way to join several wires to earth, share a live or even mend a break quickly on the run. They handle quite a wide range of cable sizes, so tidy for connecting several small feeds to one main feed for example. Bag of five was something like £4.50 They seem pretty secure when closed and the live section is well shrouded too. Just handy to have around. Also good for temporary lash ups when designing something or other on the vehicle.