- Aluminium oxide flap discs for descaling, rust removal, weld preparation, weld cleaning and general surface preparation. - Pack contains four different levels of abrasion, for assorted applications and finishes. - Abrasive flaps are attached to rigid disc with epoxy adhesive - does not require backing pad. - Depressed centre discs suitable for electric and air tools. - Size/Bore: ?115/22mm. - Contents: 3 x 40G, 4 x 60G, 2 x 80G, 1 x 120G.