is this for 4awg marine wire

yes but i don’t know about using in salt water but it works on my car

How wide is the M6 1/4" from edge to edge in mm? Thanks

1/4 inch = 6.35 MM . Just over 6MM I hope that is what you need .

Does this include glueless heatshrik?

It includes heat-shrink. Not sure if it's glueless. I just heated up and it shrunk to fit.

are they solid copper? or copper clad? or plated?

I believe they are solid copper. When scratched with a file I do not see any color difference and they are not magnetic.

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HEAT RESISTANT SEAL - 3:1 dual wall adhesive heat shrink tubing withstands up to 257°F, protecting connections from moisture and corrosion.
PREMIUM CONDUCTIVITY - 100% annealed electrolytic copper ensures optimal electrical flow and minimal resistance.
HEAVY DUTY DURABILITY - Robust construction designed for high temperature and harsh environments, perfect for marine and automotive use.
VERSATILE APPLICATION - Ideal for battery cables, solar panels, golf carts, and DIY electrical wiring—engineered for professionals who demand reliability.
EFFORTLESS INSTALLATION - Flared openings and pre-cut shrink tubes speed up wiring tasks, saving you valuable time on every project.

This set includes 10 heavy-duty 4 AWG copper ring terminals with 5/16" (M8) openings, paired with 3:1 dual wall adhesive heat shrink tubing rated for 600V and 257°F. Crafted from annealed electrolytic copper for superior conductivity and corrosion resistance, these connectors provide a moisture-tight, durable seal ideal for automotive, marine, solar, and general electrical applications.

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