This DeWalt DW8310 flap disc is 69% off at Amazon. It’s the best deal we could find by $5. The 120 grit zirconia disc is meant for metal and fits 4.5″ angle grinders. Shipping is free for Prime members. Buy Now at Amazon
Features
120 grit zirconia abrasive for metal 4.5″ diameter with 7/8″ arbor hole Type 29 fiberglass backing for a 20 to 25 degree grinding angle Compatible with angle grinders such as the DeWalt DCG416B Rated for up to 3x faster material removal than fiber resin sanding discs Rated for up to 15x longer life than fiber resin sanding discs
