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

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This transaction is for thirty (30) various shaped, diamond tipped drill bits and shaped tips, 40 grit (coarse) for fast cutting. 1/8" shank diameter. Coarse grit for sanding, grinding, scratch and chip removal, pre-polishing preparation. These bits will fit in your dremel, (use 1/8" collet), roto, moto, tools. Even works in a standard electric or hand drill with variable chuck. Great for drilling, shaping, grinding, stone, pearls, glass, metal, shells, plastic, wood, etc.
Operate all rotary tools on slow speed only. Always use eye, lung, and hand protection !

These diamond tipped bits are going to come in very handy if you are working with jewelry or beads.  A fantastic price for a wonderful product. What are your waiting for ?

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DRILLING TIPS 

If you are drilling beach glass or any hard or soft stone, you need diamond drill bits. I would suggest this 40 grit 30 piece set to start with. 40 grit will cut very fast and is great for drilling holes. You get an assortment of sizes and shapes which you can experiment with. Eventually you will find certain shapes that work best for your application. I also have a 20 diamond twist drills set for very small holes 1mm and under, but suggest beginners try the larger bits to start with.

The hole you drill will be rough because the 40 grit is coarse and you may want to use a 150 grit drill to smooth the inside of the hole.  If you are stringing on wire, you may not need to smooth the inside of the hole but if you string your items on thread, you should follow up with the 150 grit bits.

Start off with good protection. Glass, stone, shell, in powder form is dangerous and not good to breath. Use good eye protection with side protection, get in the habit of using a respirator to protect your nose and mouth against the small particles you will create in the drilling or polishing process. I use a full face shield with a respirator.  Also,  buy a full size apron and wear it to protect your clothing from dust particles.

I like to drill glass or stone by holding it under water. Put the piece into a shallow container like the lid of an old mayonnaise jar. Be very careful because the combination of water and electricity is dangerous. Hold onto the glass shard (or item to be drilled) with your left hand and hold the flex shaft handle (drill) with a diamond drill bit in your right hand. Insert the drill bit tip (ONLY) through the water and drill the glass shard or stone. (You only need enough water to cover the shard laying on its side). Drill slowly at first and allow the tip to seat and then adjust your drilling once the hole has started. I drill slowly because it allows the tips to last longer.  I like to drill half way through the shard and then flip the shard over and drill through the other side of the shard to meet the hole started on the lst side. You will prevent shattering the 2nd side of the hole that way.