Non-Cosmetic, Dry Blast, Matte Finish SPI Finish D-1 — 600 Stone Prior to Dry Blast Glass Bead #11 SPI Finish D-2 — 400 Stone Prior to Dry Blast #240 Oxide SPI Finish D-3 — 320 Stone Prior to Dry Blast #24 Oxide
Non-Cosmetic, Stone Polish SPI Finish C-1 — 600 Grit Stone SPI Finish C-2 — 400 Grit Stone SPI Finish C-3 — 320 Grit Stone
SPI Finish B-1 — 600 Grit Paper SPI Finish B-2 — 400 Grit Paper SPI Finish B-3 — 320 Grit Paper
High Quality, Optical Quality SPI Finish A-1 — Grade #3, 6000 Grit Diamond Buff SPI Finish A-2 — Grade #6, 3000 Grit Diamond Buff SPI Finish A-3 — Grade #15, 1200 Grit Diamond Buff