Aluminium Oxide Flap Disc Range - Faithfull FAIFD115A80, This Faithfull 80 Grit Aluminium Oxide Flap Disc is suitable for final grinding of mild steel, carbon steel and alloys. Specification: Ø x bore: 115 x 22mm. Faithfull FAIFD115A80 Aluminium Oxide Flap Disc 115 x 22mm 80 Grit