can this fit a 10mm (3/8in) electrode?

I cant say for sure but I seriously doubt you want to run rods that large with it anyway. I imagine your rod would slip out of the grooves while welding since the grooves are more suited to 3/16 rods. Probably want to go for the 500A for large rods like 3/8! I have never used any that large

Will this works on lincoln ac225 stick welder? what is 500 amps mean? there are 300, and 200 amps, what are the differences?

Our will work, i put one on my welder. I couldn't use the little piece of copper sheet to wrap the cable though, I'm not patient enough. 500 amps is the maximum amps that it can handle.

What is the small copper piece that is in the shape of a V for the holder for?

If you have smaller wire sizes you need to insert it into the same place that your wire goes before tighten the set screw

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Reboot Welding Electrode Holder Twist Type 400AMP Full Copper Heavy Duty Electrode Clamp Accessories for Welding Machine ARC MMA Welder

Product ID: 102066490

⚡400A heavy-duty current capacity

🔩Twist-type clamp for secure electrode grip

🛠️Full copper for superior conductivity

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Description

⚡ Weld Like a Pro, Hold Like a Boss!

PURE COPPER CORE - Maximizes electrical conductivity for flawless welds every time
TWIST LOCK DESIGN - Ensures your electrode stays put, even under the toughest conditions
FITS A RANGE OF ELECTRODES - Compatible with rods from 1.6 to 4.0 mm thickness for versatile use
ERGONOMIC INSULATED HANDLES - Stay safe and comfortable during long welding sessions
POWER THROUGH WITH 400 AMPS - Handles intense welding jobs without breaking a sweat

The Reboot Welding Electrode Holder is a robust 400AMP twist-type clamp made from full copper for exceptional conductivity and durability. Designed to securely hold electrodes up to 5/16 inch thick, it features insulated handles for safety and ergonomic use. Perfect for ARC MMA welding, this heavy-duty accessory ensures reliable performance and precision, making it a top choice for professionals seeking efficiency and control.

Specifications

ASIN	B07M86W7QM
Batteries Included?	No
Batteries Required?	No
Best Sellers Rank	#33,222 in Automotive ( See Top 100 in Automotive ) #6 in Arc Welding Electrode Holders
Color	Red
Customer Reviews	4.3 4.3 out of 5 stars (318)
Date First Available	October 29, 2018
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Item Weight	1.12 pounds
Item model number	400A
Manufacturer	Reboot
Material	Copper
Package Dimensions	8.98 x 3.35 x 1.69 inches
Part Number	400A
Pattern	400A
Size	400 Amp

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