Bought a small pack of these this morning for £4.99, there are 60 in the box of differing sizes so well worth it for experimentation. The Vid is quite instructive and notes that the colour towards the end make the joints water proof and the solder is low melt so takes a bit of time to go off, though they may be a bit of a faff to use outside needing a heat gun but perhaps a soldering iron body touching may make them work. Appear suitable to me for a terminating point for multiple feeds from rails if you want to make a bus wire loop in the garden.