InstallGear 4 Gauge AWG Pure Copper Lugs Ring Terminals Connectors with Heat Shrink (10 Pack) | Electrical Connectors, Heat Shrink Terminals for 4 Gauge Wire

Very solid construction with thick metal. As others have noticed you need something heavy duty to make the connection. I don't have that but was able to get good results with a hammer and a punch on a concrete surface and the heat shrink hid the sins.ID of the mounting hole is 10.2mm. ID of the connection is 8mm which is more than enough for the 4Ga wire I bought this form. Thickness of the crimp side is about 1.4mm and the lug itself is a beefy 2.8mm.

Worked great when making my own cables!

These are some of the best Copper Lugs I have used and have become my go to. I have tried many different brands and these are the best.These will require a Heavy Duty Crimping Tool. I bought the blue and black crimping tool from Amazon and it’s a Beast, it takes a huge amount of force to crimp these. The tool I am referring to looks similar to bolt cutters (check pictures if I can include it) Highly Recommend that as well.. Other brands have very little wire inputs that concern me a wire may break loose and touch an amplifier causing damage etc. These have a 1/2”+ wire input sleeve for excellent crimping W/ enough room for a double crimp. Car Audio sites charge $30+ for 8-10 copper lugs that are smaller than these. Other brands may cost lesss but they also have much less material, so consider that when buying. Check my one photo with the TItan 8 Battery and look at the size difference between these copper lugs and another brand sold on here- Night and Day difference. These are perfect for Car Audio - Battery Banks, Capacitor Banks, and Big 3 Upgrades. Highly Recommend!

These work perfectly crimp well and the Shrink tights around good

I bought these to terminate an auto battery ground. They are thick and heavy, very good quality and have about an inch of lug where the wire goes in. The only problem is they are sold as fitting a 7/16" stud and they will not. The hole is actually about 13/32" so just a bit to small and I had to drill out the hole with a 7/16" drill bit to get it to fit around the 7/16" stud.

These lugs are VERY heavy duty. I would know, because the spades were too large for my amp to accept them and I had the wonderful task of having to cut and hammer them into shape 🤣. But once I was done feeling like I was in an episode of Forged In Fire, I got my cables terminated and heatshrinked. To crimp these, I used the hammer crimper from Temco and it was a relative breeze, if a little sloppy. The heatshrink conforms nicely with only a lighter, but the internal adhesive leaves a bit to be desired; maybe that's my fault for using a lighter instead of a heat gun? These terminals are made from a single thick piece of solid copper, folded over on itself. They do what I needed them to, and do it well while looking cool. Very high quality, worth the asking price. Recommended.

I wanted to make some custom solar cables for my generator set up. These were perfect for my needs.High quality copper lugs that crimp up nice and they come with the heat shrink to make your terminations safe.Worth it!

If you have the correct tool to crimp these, they are great. Super easy to install, and create a great connection. The heat shrink provided adds a professional install look.