Usage Tips:Note: The color of the product we ship is the color in the first picture, and the specification and quantity are shipped according to the quantity and specification described in the title. If you need to change the color or style, you need to contact us within 12 hours after placing the order. Our product Product Features:1.Excellent for making an accurate hole on various bowlder, agates, pearls, jade, etc.2.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:Product material: Metal, DiamondColor: SilverShank Diameter: 2.3mm/0.09inchHead Diameter: 2.0mm/0.08inchSand length: 6-8mmFull length: Approx. 43mm/1.69inchDimension: 2.3 x 43mm/0.09 x 1.69inch(Dia x L)Weight: 26gPackage Include:20 x Diamond Coated Hole Saw Drill Bit Note: Because the model and display effect of the monitor may be different, there may be slight differences in color, and the size is manually measured, there may be an error of 1-2cm, please understand.