Total 7 pieces, 6 pieces 6/8/10/12/20/25mm dry diamond drill bits with 1pc 1/4 inch(6mm) Carbide Drill Bit, Hex Shank Quick-fit. Drilling for Ceramic Porcelain Tile Marble Granite, etc. Wax inside for cooling, dry drilling without water.Wet use helps prolong service life. Carbide triangular drill bit: total length 77mm. Used to provide accurate positioning for diamond bit, not for drilling. Vacuum brazing technology enables a strong bond between diamond, bond and substrate, greatly improving tool life and machining efficiency. Applicable machines: Electric hand drill, bench drill, etc; Please ensure that the drill speed is 2000RPM-5000RPM. The higher the drilling speed, the longer the product life
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