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Marshalltown QLT Rub Brick, 3 in. x 6 in. Coarse 20 Grit Concrete Cleaning Block – RB192
Regular price $11.86Orders start at $399 — combine any items to reach the minimum. Learn more
Marshalltown QLT Rub Brick, 3 in. x 6 in. Coarse 20 Grit Concrete Cleaning Block
The Marshalltown QLT Rub Brick is a 3 in. wide by 6 in. long coarse 20 grit rubbing brick used to knock down mortar drips, form marks and surface imperfections on concrete and masonry. Sold as one brick, it is a standard concrete finishing accessory for cleaning formed concrete surfaces.
Key Features:
- Coarse 20 grit: Coarse 20 grit surface quickly removes mortar, form marks, and surface imperfections.
- Job-site size: 3 in. x 6 in. block size provides a good working surface that fits the hand.
- Concrete finishing: Designed as a rub brick for cleaning and smoothing concrete and masonry surfaces.
- Pro brand: Marshalltown QLT line is a trusted concrete finishing tool line.
- Ready to use: No assembly required; use straight from the box.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Marshalltown Company |
| Manufacturer model | RB192 |
| UPC | 035965064408 |
| Sell unit | 1 rub brick |
| Material | Abrasive rubbing brick (carborundum-type) |
| Nominal size | 3 in. W x 6 in. L |
| Height | 3 in. (width as listed) |
| Width | 3 in. |
| Length | 6 in. |
| Grit | Coarse 20 grit |
| Pack quantity | 1 rub brick |
| Assembly | No assembly required |
| Intended use | Cleaning and smoothing concrete and masonry surfaces, removing mortar and form marks |
Fit and Compatibility:
A standalone abrasive block with no additional accessories required. Pairs with other Marshalltown concrete finishing tools such as trowels, floats, and edgers on formed concrete work.
Frequently Asked Questions (FAQ):
Q: What is a rub brick used for?
A: It is used to rub down concrete and masonry to remove mortar drips, form marks, and other surface imperfections.
Q: What size is the brick?
A: It measures 3 in. wide by 6 in. long.
Q: How coarse is the abrasive?
A: It is a coarse 20 grit brick for fast material removal.
Q: How many bricks come in a package?
A: One rub brick per package.
Q: Does it need any assembly?
A: No, it is ready to use out of the box.
Q: Is it suitable for professional concrete work?
A: Yes, it is part of Marshalltown's QLT line of concrete finishing tools used by pros.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
A 20 grit rub brick is the go-to tool for cleaning bug holes and form marks off poured concrete walls before inspection or painting—use it dry for light cleanup or wet for heavy rubdowns to control dust. Keep the brick moving in circular strokes to avoid gouging. If you need finer finishing after rough rubdown, follow with a finer grit rubbing stone or float.
Abrasive rub bricks produce concrete and silica dust—wear a NIOSH-approved dust mask or respirator, safety glasses, and gloves, and avoid dry rubbing without dust control.
Pick up the Marshalltown QLT Rub Brick today for fast cleanup of concrete and masonry surfaces.
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