Seamless steel pipe net: 400# stainless steel pipe glossy surface
300 to 400 mesh are the polished brightness requirements of ordinary decorative tubes.
The polished stainless steel tube has a brightness of 600 to 800 mesh.
In fact, this explanation is more difficult to understand.
A grit is defined as the number of open squares that can be divided into units per square inch of area.
All are foreign words, so the English unit is used, which is about 6.45 square centimeters and about 2.54 centimeters square.
Now unified to rename roughness, no longer called finish.
This understanding is more image.
Although the surface is very smooth, there are 400*400 numbers of protrusions (depressions) per square inch, as viewed under a magnifier, called 400 mesh.
In other words, under the microscope, 400 mesh polished stainless steel tube surfaces have 160,000 observable protrusions per square inch.