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

if you’re into car audio or plan on doing any sort of mobile audio system, do yourself a favor and use these! These are such a lifesaver no more crimping wire and leaving loose stragglers hanging out of the port. And once you put the heat shrink over it makes it look much more professional! I’m running over 9500w with a 210 amp alternator a 60 amp power AMG under the hood and until it blew out was running an excess 3400 or 3600 even without the access once I redid everything with these, I’m not even getting any dimming or any warmth whatsoever! So my little Genesis is handling it like a beast

Used with 0 gauge ct sounds wiring kit. Fit really snug and have had 0 complaints since installing about 3-4 months ago. Would definitely recommend as I’ve seen issues with having loose wire strands with other ferrules. Definitely beginner friendly as well as this was my first setup and project done.

They fit great. Works good

Does the job. Happy with the purchase

Very happy with these they cleaned up my wiring a lot.

These would have worked perfect if I would've ordered the right size. Totally my fault! Will order right size

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

Used to reduce my 2 gauge down to 4 gauge. There was room to spare as these are for 0 gauge so these should fit 2 gauge perfectly. Wish the heat shrink was longer but the pieces provided were great and shrunk tight without issues.