We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Blue and grey fluted silicon carbide rubbing brick with handle, model 840

Marshalltown Trowel

Marshalltown Trowel 840 hand tool

SKU CH-62DK-C636H MPN 840

A 6-by-3-inch silicon-carbide rubbing brick with fluted handle for professional concrete finishing, model 840, weighing 1.63 units

  • Product typeConcrete Tools
  • Key features* Intended for the true professional to stand up t
  • Product weight1.63
  • Sold asEach
  • Silicon-carbide abrasive removes concrete quickly
  • 20-grit surface levels rough pours efficiently
  • Fluted brick design clears dust while you work
  • Integrated handle gives secure grip on wet surfaces
  • 63 kg weight balances control with low fatigue

Professional concrete finishing tool

The Marshalltown 840 is a silicon carbide rubbing brick designed for professional concrete work. Its fluted surface with integrated handle provides secure grip during surface preparation and finishing tasks. The blue and gray brick measures six inches by three inches by one inch and weighs 1.63 units.

Replaces worn rubbing bricks

This tool replaces exhausted or damaged rubbing bricks used for smoothing and dressing concrete surfaces. The 20 grit silicon carbide abrasive maintains cutting efficiency longer than softer alternatives. The jump is worth it when existing bricks no longer remove material evenly or have lost their fluted profile.

Suits professional masons and contractors

The 840 suits professional masons, concrete finishers and contractors who need reliable surface preparation tools. It is not intended for light DIY patching where a smaller abrasive block would suffice. Buyers who need powered grinding equipment or diamond-impregnated pads for heavy stock removal should look at dedicated floor grinders instead.

How it compares

Measured against everything we stock in Utility & Specialty Hand Tools, at today’s prices. Recalculated every night.

Price $15.99
Cheaper than about 66% of the 2,474 comparable items (median $23.99).

Specifications

Product
Brand nameMarshalltown
Model name840
Product typeConcrete Tools
Size & build
Shipping weight0.84 kg
Package size152 × 92 × 76 mm

Questions about this item

What are the overall dimensions of the 840 rubbing brick?

The 840 rubbing brick measures 6 inches in overall length, 3 inches in overall width and 1 inch in overall height.

How is the 840 rubbing brick used on a concrete surface?

The fluted brick design with integrated handle is rubbed directly across the concrete to smooth or dress the surface using the silicon carbide abrasive.

When should the 840 rubbing brick be replaced?

Replace the brick once the 20 grit silicon carbide flutes have worn down and no longer abrade the concrete effectively.

More in Utility & Specialty Hand Tools

Similar items