Note: The color of the item may vary slightly due to photography and your own computerFeatures:1.Excellent for making an accurate hole on various bowlder, agates, pearls, jade, etc.2.High quality and long life span.Note: Generally, the punching needle needs to be slowly imported when starting to punch, and then punched hard. Harder stones like ice, rocks, or agate. The punch pin may not be durable. In this case, we recommend adding emulsified oil to the water to achieve a more lubricating effect.Specification:Material: Metal, DiamondColor: SilverShank Diameter: 2.3mm/0.09inchHead Diameter: 1.3mm/0.05inchSand length: 6-8mmFull length: Approx. 43mm/1.69inchDimension: 2.3 x 43mm/0.09 x 1.69inch(Dia x L)Weight: 24gPackage Include:20 x Diamond Coated Hole Saw Drill Bit