Specification Brand : JINGLING BulletPoint1 : Product Name: Diamond Grinding Head ,Gemstone carving tools, Diamond carving burrs BulletPoint2 : Head diameter: 2.5mm(3/32"); Shank diameter:2.35mm(3/32"); Total length:42mm BulletPoint3 : Head Shape: Spherical Concave Head; Speed:2800-50000RPM; Grit: 150 Medium BulletPoint4 : Apply to stone carving, jade carving, gem peeled, bone carving, egg decorating, glass carving BulletPoint5 : Suitable for electric nail drill, carving machine, machinery supporting assembly with a 3/32" collet Color : Silver ExternallyAssignedProductIdentifier1 : 708747498998 ExternallyAssignedProductIdentifier2 : 0708747498998 ExternallyAssignedProductIdentifier3 : 00097758241076 ItemDisplayDimensions_Length : 42 millimeters ItemName : JINGLING Diamond Grinding Head 2.5mm Spherical CONCAVE Jade Carving Burrs 30Pcs ItemPackageDimensions_Height : 0.39 inches ItemPackageDimensions_Length : 4.33 inches ItemPackageDimensions_Width : 4.33 inches ItemPackageQuantity : 30 ItemShape : Sa-5 ItemTypeKeyword : cutting-burrs Manufacturer : JINGLING Material : Metal MeasurementSystem1 : Imperial MeasurementSystem2 : Metric ModelName : SA-5 ModelNumber : 24107 NumberOfBoxes : 1 NumberOfItems : 1 PartNumber : 708747498998 ProductDescription : JINGLING 30Pcs 2.5mm SPHERICAL CONCAVE Head Diamond Mounted Point Grinding Tip Lapidary Carving Tools Code 25Q Product Specification: Product Name: Diamond Grinding Head, Gemstone carving tools, 2.5mm Diamond carving burrs Head Diameter: 2.5mm (Close to 3/32") Total Length: 42mm (1-21/32") Shank diameter: 2.35mm (3/32"). Suitable for electric nail drill, carving machine with a 3/32" collet Grit: 150 Medium Quantity: Total 30Pcs Head Shape: SPHERICAL CONCAVE Head Speed: 2800-50000RPM, electric grinder speed as high as possible Product use: Apply to stone carving, jade carving, gem peeled, bone carving, egg decorating, glass carving etc Used for sculpturing, dressing, precision grinding and internal grinding carbide in ceramic, glass, precious stone, alloy and many the abrasive materials The diamond mounted point can be installed on the electric grinder, hanging mill and hand electric drill (not included here). Never use drills while machine is in hammer action Use with water as a lubricant Note: carving must use cold water to cool the workpiece and the grinding head polishing, moment also can't do without water We can list any size (head diameter from 0.8mm - 16mm) amount of this product Just a friendly reminder: The Shank diameter of grinding bit is 2.35mm (close to 3/32") There are two different collet sizes for Dremel: 3mm (1/8") or Universal 3-jaw chuck If your chuck of Dremel (models 4300-8050) has an Universal 3-jaw chuck, then the grinding bit can be installed directly However, it is NOT suitable for dremel with 3mm 1/8" chuck (such as:models 3000,4000) If your chuck of Dremel is 3mm (1/8"), maybe you need add the Universal 3-jaw chuck for Dremel ProductSiteLaunchDate : 2020-08-03T12:51:50.703Z Size : Head Diameter: 2.5mm (3/32") StreetDate : 2017-10-21T00:00:01Z Style : Cylindrical bur with plain end (uncut) – Shape A SupplierDeclaredDgHzRegulation : not_applicable UnitCount : 1 UnspscCode : 31191600