Specification Brand : DEWALT BulletPoint : Advantage: Wear-resistant and heat-resistant, not easy to stick to the holders or workpieces or break up.Vacuum hardening, exquisite craftsmanship, easy cutting. BulletPoint1 : DEWALT Black & Gold Hex Shank Metal Drill Bits feature a black and gold finishing to prevent rust. BulletPoint2 : Strong tapered core design provides extreme durability to resist breakage BulletPoint3 : The bits feature a 1/4\ BulletPoint4 : Black & Gold Metal Drill Bits are made of heavy-duty High Speed Steel for drilling into a variety of materials including plastic, wood, and metal. BulletPoint5 : 135° split point tip design helps to reduce walking. Color : Multi CompatibleMaterial1 : Porcelain CompatibleMaterial2 : Marble ExternallyAssignedProductIdentifier : 7595611098292 ExternallyAssignedProductIdentifier1 : 885911763592 ExternallyAssignedProductIdentifier2 : 0885911763592 FinishType : Silver IncludedComponents : 23/64IN BLACK AND GOLD IR DRILL BIT ItemName : Dewalt 23/64In Black & Gold Impact Ready Metal Drill Bit ItemPackageDimensions_Height : 0.4 inches ItemPackageDimensions_Length : 8.3 inches ItemPackageDimensions_Width : 1.9 inches ItemPackageQuantity : 1 ItemShape : Straight ItemTypeKeyword : core-drill-bits Manufacturer : DEWALT Material : Metal Material1 : Blend Material2 : Blend Material3 : Blend Material4 : Blend Material5 : Blend ModelNumber : DWA5023 NumberOfItems : 1 PackageLevel : unit PartNumber : DWA5023 ProductDescription : JINGLING Premium Quality 30Pcs 1mm Diamond Drill Bits with 1/8" Shank for Dremel Jewelry Making Lapidary Supplies Tools for Gemstone Sea Glass Shells Rocks Specifications and shapes: Product Name: Diamond Drill Bits For Stone, Tile Drill Bits Ceramic Diamond, Drill for Jewelry Making Heads Shapes: Cylindrical Heads Diameter: 1mm (1/24"), Solid not Hollow Shank Diameter: 3mm (close to 1/8") Suitable for dremel, various carving machine,lapidary equipment,flex shafts with 1/8" chuck Drill Depth: 8mm(5/16") Total Length: 45mm(1-3/4") Grit: 120 (medium) Premium type diamond coated grit 120, more durable than ordinary diamond drill bit set Color: Silver Material: High Carbon Steel, Diamond Quantity: 30Pcs Application: Grinding, Drilling Recommended speed: 24000 RPM 1mm diamond tipped drill bit is ideal tools for dremel accessories and jewelry drill kit Suitable for drilling holes in rocks, sea glass,shells, ceramic, jewelry, etc. Jewelry drill bits are used to make beads, earrings, pendants Use with water as a lubricant is better Keep the hole you're drilling constantly bathed in water or feed water to the drilling spot. If there is not enough water to cool, the diamond at the front of the stone drill bit will quickly wear off because of high temperature. Light pressure and slow feed rate are beneficial for chip removal, allowing the head of the glass drill bits to continuously grind the material being processed. Just a friendly reminder: The Shank diameter of grinding bit is 3mm (close to 1/8 inch) If your chuck of Dremel is 3mm (1/8 inch) or Universal 3-jaw chuck, then the diamond tip drill bit can be installed directly However, it is NOT suitable for machines with 3/32 inch chuck, such as Electric Nail Drill