Can anyone please tell me where I can buy the replacement fiberglass brushes for this item?

There are replacements from Euro Tool PN: BRS-294.01. They used to be sold on amazon but it doesn't look like they are available right now. They are 1.25 inches long and an exact replacement for this brush.

Can you advance the fibers as the fibers wear down? Like a mechanical pencil as the lead wears down.

Yes you can advance the fibers just like a mechanical pencil. These are glass fibers and you should avoid getting the residue on your skin because it will cause you to itch but is not harmful. Pen is a life saver to clean awy corrosion from contacts.

What is the diameter of the fiber bundle?

in the pen, mine is not quite 3/16 on an inch in diameter, or about 4 mm. They are a tiny bit smaller ub the package, to allow you to more easily load them into the pen. They spread a tiny amount after you start using it. Hope this helps

Does it work with laptops and stuff? not the screen I'm talking about aluminum I need to polish the aluminum part behind the screen

It won't really polish. If you're looking for a shiny surface, this is not the tool for that. I will leave a surface looking like it had been worked on with a wire brush.I use mine to remove contaminants from battery terminals and other types of contacts.

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Eurotool Scratch Brush, Fiberglass (Colors may vary)

Product ID: 376915917

Details

Material
fiberglass
Brand
Eurotool
Grit material
Nylon
Bristle type
Straight Wire
Product dimensions
11.4L x 11.4W

⚡Medium grit for effective rust removal

🛠️4.5-inch precision reach

🇩🇪Made in Germany quality

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NZ$226

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Sold byAmazon Cook IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Rust doesn’t stand a chance—brush up your precision game!

COMPACT LIGHTWEIGHT - Only 4.5 inches and 0.03 lbs for effortless control
PINPOINT RUST REMOVAL - Pen-shaped handle for tight, hard-to-reach spots
ENGINEERED FOR ELECTRONICS - Safe and precise for delicate electronic applications
COLOR VARIETY UNIQUE STYLE - Assorted vibrant colors to match your toolkit vibe
DURABLE FIBERGLASS BRISTLES - Medium grit designed to remove corrosion without damage

The Eurotool Fiberglass Scratch Brush is a compact, 4.5-inch tool crafted in Germany with medium grit bristles designed for effective rust and corrosion removal in tight spaces and sensitive electronic components. Lightweight and available in assorted colors, it’s the perfect precision tool for professionals who demand quality and control.

Specifications

Colour	Original version
Grit type	Medium
Unit count	1.0 Count
Number of pieces	1
Recommended uses for product	Grinding, Rust Removal, Deburring
Manufacturer	Eurotool
UPC	654207124245
Product Dimensions	11.43 x 1.27 x 0.1 cm; 13.61 g
Item Weight	0.03 Pounds
Batteries required	No

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