Home / Brake Lathe Accessories / Rotor Finishing Tools / 3″ Brake Rotor Grinding Discs – 120 Grit – 20 PK. 3″ Brake Rotor Grinding Discs – 120 Grit – 20 PK. $35.33 Part Number: 9989-20 Brake Rotor Finishing Discs made of aluminum oxide. 3" Brake Rotor Grinding Discs - 120 Grit - 20 PK. quantity Add to cart UPC: 682488099914 Category: Rotor Finishing Tools Tag: 3" Grinder Discs 120 Grit You may also like… 3″ Brake Rotor Grinding Discs – 120 Grit – 12 PK. $24.53 Part Number: 9989-12Add to Cart 10 PC. Abrasive Pad Non-Directional (Swirl) Grinder Disc Kit $28.67 Part Number: 9989Add to Cart Related products 10 PK 80 Grit Ammco Style PSA Discs $27.38 Part Number: 989-10Add to Cart 50 PK 80 Grit Ammco Style PSA Discs $120.16 Part Number: 989-50Add to Cart 20 PK 80 Grit Ammco Style PSA Discs $52.02 Part Number: 989-20Add to Cart 9 PC. Swirl Tool Kit with 4″ Hook-and-Loop Backed Discs $175.87 Part Number: 999Add to Cart