I worked for a fairly big telephone company for many years, they furnished us with multiple size crimpers for splicing the smaller gauge telephone wires
I wish I had been able to bag some of the larger crimpers and connectors for 000 down to maybe #8 gauge, but I didn't
The alternative solder and heat shrink works good for me
A lot better than the cheaper crimp on ends you can buy from your general automotive parts store I buy Belden connectors when I can get them