AIRIC UL Listed Non Insulated Butt Connectors 12-10 AWG, 100 pcs Electrical Seamless Crimping Terminals, Uninsulated Wiring Crimps Connector, Bare Copper Crimp Splice Terminal for 12,10 Gauge Wire

Good quality, thick enough to get a firm crimp and it not pull loose.

Use these connectors in various sizes. They work very well just as they should. I would recommend them.

I use these in conjunction with heat-shrink tubing to get a mechanically strong electrical connection that is more water-tight and gives you a smaller in diameter connection than is possible with plastic insulated butt connectors. Fast and efficient time saver.

These are the heavy duty connectors I was looking for.

These work great and crimp nicely.

These are very sturdy, will need a good set of crumpers or a very strong hand. They seem to do a good job trapping the wire, used these with heat shrink

These tinned copper non insulated butt splices are a must have for wiring in boats. Used with a hydraulic crimper and heat shrink you get a factory like connection every time and know it will last forever.

Add heat shrink tube on the line first, and you are good to go.