4PCS Heavy-Duty Brass Amp Input Reducers 1/0 Gauge to 4 Gauge - Durable Amp Connectors with Heat Shrink Tubing for Car Audio Accessories

Definitely use a set of these (in the right size for your amp wiring points) they fit right in for mine and work great definitely perfect for if you want a super solid connection without worrying about the wires touching being shoves directly in the amp holes. Do it with these or get the metal aglets for the wires. Easy to use and looks decent and hold pretty dang tight. For the price they work good and comes with extra goodies like shrink wrap and wire ties and such.

Works good with my amplifier. It is easy to use and holds the wire really well

Very good quality, the heat shrink makes it look more professional and definitely fits 0 guage and fits right into the 4 on my amp

Works as described

We used these on a 4CH amp running 1/0 froma a distribution block (1/0 is unnecessary for a full range amp) because we had more 1/0 than #4. With a kit of ferules the install results where proper.

set well with my amp

sturdy but had to grind down post to force it to fit

Does the job. Happy with the purchase