These Diamond Engraving Tip Bits can be engraved in a wide variety of materials, like DIY jewelry making, metal, stone, plastic, glass, ceramic, wood, leather, and more.SpecificationSize: 30x2.3mm/1.18x0.09 inch;Tip diameter:1mm/0.04 inch;Material: Diamond;Shank diameter:2.35mm/0.09 inch;Color: Silver;Packing List: 15 Pcs Engraving pen replacement nibsAdvantageThe Engraving pen replacement nibs are made of diamond, it is high in strength, ultra-wear-resistant, impact-resistant and durable. Each replacement nib is equipped with a plastic container, which is small in size and easy to carry.InstructionHold the engraving pen in your left hand, lift the grinding head changing tool， and turn the button lock counterclockwise to pull out the diamond engraving tip bit.
eBay