Choosing the right kind of abrasive is the most important part of taking the product to perfection. A flap disc is made up of multi layered overlapping abrasive materials. These are like flaps. So, that’s why it is called a flap disc. These are usually made with polyester or polycotton materials to which these abrasive particles are joined. These are attached to a backplate that provides the stability while grinding. Use these in various processes of metal fabrication to remove the excess materials and to smoothen the surface of the metals.