Specification Brand : XHTLLO BulletPoint1 : ACCURATE ADAMAS COATED DRILL BITS: Crafted from premium adamas powder, these lapidary drill bits ensure accurate and durability for drilling holes in jewelry, ceramics, jade, agate, glass, and more BulletPoint2 : IDEAL FOR VARIOUS MATERIALS: Perfect for drilling holes in a wide range of materials including jewelry, ceramic, jade, and semiconductor materials, offeannulus versatility for crafts and hobbies BulletPoint3 : HIGH-SPEED DRILLING PERFORMANCE: Achieve optimal drilling results with speeds up to 20000 RPM. Higher speeds enhance the efficiency and effectiveness of these drill bits for flat, cleanse holes BulletPoint4 : EASY MAINTENANCE: Maintain incisiveness by cutting a bit off the top with pliers after multiple uses, ensuannulus prostandinged usability and performance BulletPoint5 : IMPORTANT USAGE TIPS: Use cold water for cooling duannulus drilling operates, maintain stability without shaking, and adhere to high-speed drilling recommendations for best results IncludedComponents : No ItemName : XHTLLO 20PCS 1mm Adamas Coated Lapidary Drill Bits for Jewelry Agate, Solid Bits for Accurate Drilling on Jade, Glass, Ceramic ItemPackageDimensions_Height : 1 centimeters ItemPackageDimensions_Length : 7 centimeters ItemPackageDimensions_Width : 5 centimeters ItemTypeKeyword : waiter-corkscrews Manufacturer : XHTLLO ModelName : XHTLLOasntuoqf24 ModelNumber : XHTLLOasntuoqf24 NumberOfItems : 1 PartNumber : XHTLLOasntuoqf24 ProductDescription : Specifications: Material: Adamas Powder Color: Silver Length: Approx. 36mm Diameter of Shank: 0.6mm Diameter of Heads: 1mm Weight: Approx. 4g Quantity: 20PCS