1mm 20 pcs. 2mm 20 pcs. 3mm 20 pcs. Diamond Drill Bits - 1/8 inch shank Suitable for use with hand drills, flex shafts, and Dremel tools Ideal for jewelry making, including necklaces, earrings, pendants, and bracelets using sea shells, beach glass, rocks, and other materials Drill clean holes in tiles, marble, rocks, ceramic, porcelain, and gemstones Requires practice; breakage may occur during initial use Use with water cooling only—do not operate dry Total length: 1.77 inches Packaged in a plastic storage box for easy carrying and organization Can be used on beach glass, sea shells, rocks, marbles, and similar materials Color: Silver Material: Diamond-coated Sizes: 1mm, 2mm, 3mm Package includes: 2 sets of 30 diamond grinding needles (60 pieces total) Note: Begin drilling at an angle and gently move the bit to widen the hole. Allow the tool to do the work—avoid excessive pressure. These are fine, small-diameter bits with a thin diamond coating and are not suitable for heavy-duty use. Package contains only the items listed above. Other accessories or tools shown are not included. Note: Lighting and display settings may cause slight color variations between the product image and actual item. Measurement may vary by +/- 1-3 cm.