Made in USA 7" Diam x 1-1/4" Hole x 1/2" Thick, N Hardness, 100 Grit Surface Grinding Wheel Diamond, Type 1A1, Fine Grade 03570728 - 03570728 - Penn Tool Co., Inc
MAYAGU 6 Inch Diamond Grinding Disc CBN Grinding Wheels for Sharpening Metal Stone Grinding and Processing (100 Grit): Amazon.com: Industrial & Scientific
Diamond Pacific Hex Galaxy Wheels for sale at SUVA Lapidary Supply