HFV Car Audio 1/0 power ground wire cable butt splice crimp connector- 2 pack
Solid copper with tin plating for maximum conductivity and no loss.
 
Comes in 1/0 or 4 Gauge sizes.
 
These are thick, heavy duty crimp connectors. You need a crimping tool to install these.
Here is a link to a cheap hammer type crimper here: https://amzn.to/4neAG7x
Here is a link to a cheap but good hydraulic crimper: https://amzn.to/45PL2VE
 
Ever have everything ready to install and your power or ground is a little short? Or you just have extra pieces laying around? Well you can use these to join two pieces together. Be sure to heat shrink after installing. (heat shrink not included)