Grinder Bits, 2 pk Grit:Ultra Fine Stiff Black (000101) has a

Stiff Black (000101) has a slightly higher viscosity

Compared to other copper-bearing styles of similar saturation

or sheet glass

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In those cases

Grinder Bits, 2 pk Grit:Ultra Fine Stiff Black (000101) has aFits most standard grinders. Includes two bits, two hex wrenches, and installation instructions. Use 60 mesh bits (Coarse Grit) for removing a lot of material at once. Use 100 mesh bits (Standard Grit) for grinding and shaping. Use 220 mesh bits (Fine Grit) for refining the edges and removing any little chips. Use 600 mesh bits (Ultra Fine Grit) for smoothing (use a LIGHT touch so as not to actually remove any additional glass and alter the shaping,