Silicon Carbide Flat Rubbing Brick With Handle Made in the USA The flat oval shape provides

The flat oval shape provides maximum contact with the blade for fast sharpening

or if you are using split point or 115-140 degree bits that are used to drill into harder metal

Unlike the Super Stones (now called Sharpening Stones) these have a traditional water stone bond

Step 4 - Switch to the other side of the blade's edge and repeat the sharpening process to finish the edge

it cannot take a dull edge and refine it to a new sharpened edge

Silicon Carbide Flat Rubbing Brick With Handle Made in the USA The flat oval shape providesHand Cleaning and Smoothing Surfaces The Flat Silicon Carbide Rubbing Brick is a very coarse 24 grit block of silicon carbide abrasive. It is commonly used by masons and machinists for cleaning and smoothing castings, concrete, tile and other surfaces. Silicon Carbide Silicon carbide is ideal for fast material removal. Its abrasive nature makes it perfect for quickly performing operations like coarse sharpening, shaping, leveling, or removing burrs