FLAP DISC Zirconium Ø115mm Ø22mm Bore 40, 80, and 120 GritZirconium flap disc for descaling, derusting, weld preparation, weld cleaning and general surface preparation.More durable than normal sanding discs.Abrasive flaps are attached to rigid disc with epoxy adhesive - does not require backing pad.Depressed centre discs suitable for electric and air tools.More durable than normal sanding discs.