If you are a war games hobbyist, making jewelry, orworking with glass, wood, metal, or stone, you need this great set !Thirty pieces - all different shapes and sizes, 40 grit (coarse). I use thecylindrical shaped tips for drilling beads. The flat top allows you to getthehole started without the bit traveling around (even on a curvedsurfaces). Once the hole is started and the bit is seated, i switch to a diamondtwist drill for faster drilling. The cone shaped tips are great for shapingstone settings. I keep all four grits handy for my work, (40, 120, 150, 600).Using thesefour grits, you can take most rough stone to pre- polishstate. You will love these !

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