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Note: The color of the item may vary slightly due to photography and your own computerFeatures:Apply to jade carving, stone carving, bone carving, glass carving etc.Especially suitable for forming and grinding spherical bead, etc.Used for sculpturing, precision grinding in precious stone, ceramic, glass, many the abrasive materials.The speed of 2000-3000 r/min.The Diamond grinding head can be installed on the Bench drilling machine, hand electric drill (not included here). Never use drills while machine is in hammer action.Specifications:Material:Metal,DiamondColor:SilverShank Diameter:6mmPolished Size:14mm/ 9/16"Type:FineGrit:120 MediumDimension:12 x 48mm/0.55 x 1.89"(Dia x L)Weight:37gPackage includes:1 x Diamond Mounted Point Spherical Concave Head Grinding Bit Note: The color of the item may vary slightly due to photography and your own computer Features: Apply to jade carving, stone carving, bone carving, glass carving etc. Especially suitable for forming and grinding spherical bead, etc. Used for sculpturing, precision grinding in precious stone, ceramic, glass, many the abrasive materials. The speed of 2000-3000 r/min. The Diamond grinding head can be installed on the Bench drilling machine, hand electric drill (not included here). Never use drills while machine is in hammer action. Specifications: Material:Metal,Diamond Color:Silver Shank Diameter:6mm Polished Size:14mm/ 9/16" Type:Fine Grit:120 Medium Dimension:12 x 48mm/0.55 x 1.89"(Dia x L) Weight:37g Package includes: 1 x Diamond Mounted Point Spherical Concave Head Grinding Bit window.adminAccountId=220502602.Item specifics:Model number: 12mmIs customized: YesDiy supplies: MetalworkingType: Diamond Concave Grinding