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How large is a 4-grit abrasive particle?
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abrasive
Worker using an angle grinder to smooth a piece of metal.
A 4-grit abrasive particle measures approximately 6 millimeters, or about 1/4 inch, in diameter.1
It is important to clarify that the term "grit" in the context of abrasives refers to the particle size of the material used for grinding or polishing, rather than the sedimentary rock composed of sand-sized grains and pebbles also known as grit.21
Abrasives are typically crushed to specific sizes, ranging from coarse grains like 4 grit to extremely fine powders as small as 900 grit, which measure about six microns.1