The grit chosen depends on the job you need the orbital pad for. The grit of a piece of sandpaper refers to the quantity of abrasive units per square inch on the sanding disc. The low number of 60 indicates that there are not very many abrasive grains compared to the high number of 3,000. If there are a high number of units on the disc, the result will be very refined. However, more does not mean that the result will be better. It just depends on the project and the stage of completion.
|60 to 80||Extremely coarse sandpaper that is good for grinding rust from metals.|
|120 to 150||These disks have a strong impact and remove surface debris quickly.|
|220 to 320||The medium-grade sanding disks remove surface debris at a moderate pace.|
|1,200 to 2,000||These extremely fine surfaces are excellent for finishing work.|