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

Reboot Welding Electrode Holder Twist Type 400amp

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Description

⚡ Weld Strong, Weld Smart – Own the Spark!

BUILT TO LAST - Premium full copper brass body ensures durability and superior conductivity
PRECISION GRIP - Twist screw clamp securely holds electrodes up to 5/16 inch with zero slip
COMPACT ERGONOMIC - Lightweight 21.5x8x4 cm design with insulated handle for comfortable, safe operation
FLEXIBLE WELDING ANGLES - Electrode bends up to any angle while maintaining a firm hold for versatile use
POWER THROUGH LIKE A PRO - Handles 300-400 amps for industrial-grade welding performance

The Reboot Welding Electrode Holder Twist Type 400AMP is a robust, full copper brass electrode clamp designed for heavy-duty welding tasks. Supporting 300-400 amps and electrodes up to 5/16 inch, it features a twist screw mechanism for a secure grip and an insulated handle for safety. Its compact size and flexible electrode bending capability make it an essential tool for professional welders seeking reliability and precision.

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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