Fuse holder

I’m having a hard time finding a in-line fuse holder for 4/0 gauge wire .

If I make a fuse holder myself what should I use to the blocks brass,copper,aluminum ?

Since the fuse holder will be under the hood I don’t want it to corrode and give me issue down the road
 
I searched for 4 guage fuse holder...
EDIT: 4/0 is not #4. My bad. Are you really looking for a fuse holder for #0000 wire?
https://www.amazon.com/Carviya-Wate...rds=4+gauge+fuse+holder&qid=1671728814&sr=8-2
1671728888274.png
 
Yes looking for one for 4/0 (0000) gauge wire .
But I think I figured out a different way and use 1 spot of my distribution block for this .

Since this wire is from the alternator to the back battery can’t I just use 1 spot on my fused distribution block so if something happens to the run of wire it kills the fuse in the back cutting power off to that wire .

Or would it be wise to put a in line fuse holder on both needs of the wire

Like 1 at the output of the alt and 1 at the back of the truck to the battery
 
Historically one DIYs it using Spauldite, Benelex J or similar mounting material and industrial T&B or similar properly torqued, corrosion proof bolt, flat, spiral lock hardware and wire terminated with properly crimped ring tongue connectors, anti-corrosive lubricant/sealant.

As a one time deal too expensive for most, so while best to pay your local battery installer or industrial power & controls distributor to make them, though nowadays there's vehicle, Marine options, so more to (re)search.