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About the product ➤Very popular drilling burr tools used by Jewelry Designers for drilling holes in Beach Sea Glasses, Stones, Rocks for making Necklaces, Earrings, Pendants and Bracelets. ZFE tools have multiple layers of fine industrial diamond particles bonded to the tips which provides for longer drill life. ZFE tools are excellent for drilling through materials up to 1/2" thick. Product Features: ▲Quantity:90pcs Diamond Burrs ▲1/8 inches(3.175mm) Shank ▲The total length of 1.77 inches ▲Plastic box packaging, easy to carry and store ▲Can drill Beach Sea Glass, Sea Shells, Rocks, Marbles, etc. ATTENTION: DO NOT RUN DRY ➤Wet drilling only. These are delicate, very small diameter diamond drill bits. The diamond coating is very thin. Can not take any abuse. ➤Start the hole at an angle. While holding the drill in hand, carefully move the drill around just enough to ream out the sides of the hole. Let the tool do the work. Package include: ▲90Pcs/3 Box Diamond Grinding Burrs