The flap discs are suitable forl grinding carbon steel. LB21ZB can also be used for heavy duty application it is mounted using the plastic backing pad item PBI067. These flap discs are made of zirconium oxide and they have a flat pad.
The flap discs B21ZB are made with extremely eco-friendly carton fibre, bonded when hot to a fibreglass net ensuring the flapdiscs very high strength and efficiency during grinding. They are used on grinding carbon steel.