Dremel 3/16 in. Rotary Tool Cone Silicon Carbide Grinding Stone for Stone, Glass, Ceramic, Porcelain, Gemstone (2-Pack) Model# 84922 (22) $ 6 97. Dremel 3/8 in. Rotary Tool Aluminum Oxide Cylinder Shaped General Purpose Grinding Stone. Model# 932 (18) ... grinding rotary tool bits.
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