A54F - A80F - Aluminum oxide grain. A finer grit for finishes equal to a 100 grit coated disc. Finishing stainless steel. Finishing aluminum. SAITBLENDdiscs combine the long life and durability of a bonded Type 27 wheel with the flexibility and finishing capabilities of a coated disc. There is no need to change discs to go from blending to final finishing. A single disc will quickly blend your weld and finish equivalent to an 80 grit resin fiber disc, and the SAITBLEND disc will outlast the fiber disc 20:1.