Specification Brand : EFK-II Supply BulletPoint1 : 0.9mm diameter straight shank twist drills for Jewelry Pearl Driller. BulletPoint2 : 0.9mm diameter straight shank twist drills is the standard size drill bits that come with the package of majority pearl drilling machines on Amazon. BulletPoint3 : 10 drill bits/bottle. BulletPoint4 : Standard pearl drilling machine can work with drill bits vary from 0.3mm - 3mm in diameter. BulletPoint5 : Please feel free to contact us if you need any other sizes of drill bits even we do not offer them on Amazon at this time. We will try our best to fulfill your needs. Color : Silver CompatibleDevices : Drilling Machine CutType : Taper EndCutType : Tapered End ExternallyAssignedProductIdentifier : 9134816498971 ExternallyAssignedProductIdentifier1 : 0717936378270 ExternallyAssignedProductIdentifier2 : 717936378270 ExternallyAssignedProductIdentifier3 : 00887861172714 FinishType : Unfinished IncludedComponents : inc ItemName : EFK-II Supply 0.9mm Diameter Straight Shank Twist Drill Bits for Jewelry Pearl Stepless Driller ItemPackageDimensions_Height : 11.6 centimeters ItemPackageDimensions_Length : 3.4 centimeters ItemPackageDimensions_Width : 9.3 centimeters ItemPackageQuantity : 1 ItemShape : Round ItemTypeKeyword : taper-shank-drill-bits Manufacturer : EFK-II Supply Material : Stainless Steel ModelNumber : eboxer-1kf53eypraw552 NumberOfItems : 1 PartNumber : eboxer-1kf53eypraw552 ProductDescription : Feature: 1. Refined and completely ground, each product will wear several times after processing, and the best treatment makes it easier to use. 2. After quenching, the components have high hardness and wear resistance, are not easily damaged, and have a long service life. 3. Highquality highspeed steel materials, hard and not easy to break, will bring you a better experience. 4. The morse taper sleeves is easy to stall and maintain, which is very useful. 5. Can be used with tapered shank drills, tapered shank cutters and tapered reamer.