What it’s used for:
Sandpaper is used to remove a small amount of material to either create a smooth surface or to remove a layer of something such as paint.
This is a hand tool that is best used with a sanding block because it is more comfortable for the user and it creates a flat surface of the sandpaper to be wrapped around.
Parts it consists of:
Sandpaper is a basic hand tool which is just paper with abrasives attached to it with an adhesive. Sandpaper is available in different grit sizes which are shown by a number on the back.
Low numbers like 40 means it is very coarse and higher numbers like 300 mean it is very fine which will give a smoother finish. The numbers on the back of sandpaper simply mean how many abrasive particles there are per inch of sandpaper.