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[Diamond Hole Drill Bit Size] Dry diamond core drill bits equipment size included:10pc-6mm hole diameter drill bits with 1/4 Hex Shank,length is 65mm. [Dry Drilling] Design that will soften and cool the reducing floor throughout dry drilling,you can also use water as an additional coolant to extend the life of the drill bits. [Wide Application] Diamond hole noticed set have broad application,you can use them to drill holes on your ceramic pots,also can use in numerous tough materials such as:Granite,Tile,Glass,Marble,Brick,Stone,etc. [1/4 Hex Shank] Drill bits are hex shank design that's extra compatible for electrical drill chuck,not clear to slip when working,improve work efficiency. [Friendly Reminder] In order to enhance the provider lifetime of the drill,it is usually recommended to open the small moon stress groove on the merchandise at a forty five degree Angle in the course of the total high-speed process, and then slowly erect the drill to ninety degrees Please be aware that the bodily barely colour distinction or difference, would not impression the use, please don't mind, thank you! With or with out scales, they're shipped randomly and can't be specified. Colour:Black Material:diamond Package Contents: 10 * diamond drill bits Only the above package content, different item will not be included. Note: Light reflection and various displays can cause the colour of the item in the photograph somewhat diverse from the genuine thing. The size allowed error is +/- 1-3cm.