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

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 - Ensures maximum electrical conductivity and durability under intense heat.
TWIST LOCK DESIGN - Securely clamps electrodes up to 5/16 inch, preventing slips during critical welds.
ERGONOMIC INSULATED HANDLES - Comfortable grip with safety insulation for long welding sessions without fatigue.
POWER THROUGH WITH 400 AMPS - Handles high current loads effortlessly for professional-grade welding.
FLEXIBLE ELECTRODE POSITIONING - Bend electrodes up to 1 inch from the head at any angle without losing hold.

The Reboot Welding Electrode Holder is a heavy-duty, full copper clamp designed for ARC MMA welders, supporting up to 400 amps. Its twist-type mechanism securely holds electrodes up to 5/16 inch thick, with insulated handles for safety and comfort. Built for durability and precision, it’s a top choice for professionals demanding reliable performance.

Specifications

ASIN	B07M86W7QM
Best Sellers Rank	#32,367 in Automotive ( See Top 100 in Automotive ) #5 in Arc Welding Electrode Holders
Color	Red
Customer Reviews	4.2 4.2 out of 5 stars (322)
Date First Available	October 29, 2018
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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