From Amazon
Dremel 85602 Silicon Carbide Grinding Stones Accessory Set, 3 Stones for Grinding, Sharpening and Engraving in Stone, Glass and Non-ferrous Metals (10,3 mm)
Conrad Electronic
Dremel 26155602JA Silicone carbide grinding stone Dremel 85602 Shank diameter 3.2 mm 3 pc(s)
Rapid Online
Dremel 26155602JA 85602 10.3 mm Silicon Carbide Grinding Stone-Pac...