Do these fit optima 34/78 ?

not sure, did not use my purchase to add to a battery

what size do i need for a 12v battery to make/use on a dry box?

These should work fine. The voltage and size (Amperage Hours) of the battery doesn't matter as much as the connection you will be putting on the battery. Of course, you could have a thin wire (ex. 20 awg) from an LED light let's say to a 5/16" circle terminator, connected to 15ah battery or a 6 guage wire from a trolling motor to a 5/16" terminator connected to a 100ah battery. This size should work fine for your battery box either way. It's what I used them for.

Can these be mounted on a metal (conductive) box?

Yes, they are isolated by the collars at the mount.

What temperature is this rated for? Is it firewall-safe such that it withstand an engine fire?

I would definitly say ,,, NOT Fire safe Proof to engine fires.

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5/16 Inch Stud 8mm Remote Battery Power Junction Post Connector, Red and Black Battery Terminal Post, 2Pcs

Product ID: 114890685

Details

Item Pitch
8 Millimeters
Connector Type
Screw
Number Of Contacts
2
Mounting Type
Screw Mount
Material
Copper Plastic
Brand
LC LICTOP

🔩5/16" dual nut stud for secure multi-wire connections

🛡️Pure copper construction resists corrosion & maximizes conductivity

🟠⚫Color-coded red & black for instant polarity ID

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₨301

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Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Power up your setup with flawless connections—because every amp counts!

VERSATILE POWER HUB - Perfect for RVs, boats, trucks, solar setups, and industrial welding machines.
PREMIUM COPPER POWER - Pure copper terminals deliver superior conductivity and corrosion resistance.
ROCK SOLID CONNECTIONS - Dual nut tightening system locks wires in place—no loosening, no fuss.
INSTANT POLARITY CLARITY - Red and black color coding eliminates installation guesswork.
QUICK DISCONNECT CONVENIENCE - Removable terminals enable fast servicing without cutting wires.

The LC LICTOP 5/16 Inch Stud Battery Terminal Post Kit includes red and black pure copper connectors designed for secure, corrosion-resistant power distribution. Featuring a dual nut tightening system and color-coded posts, these terminals simplify wiring for automotive, marine, RV, solar, and industrial applications, while allowing quick disconnection for easy maintenance.

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Fantastic experience overall. Will recommend to friends and family.

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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