Diamond Dry Vacuum Brazed Drilling Core Bits Set. Feature:Advanced vacuum brazing production process. More Heavy Duty and Wear Resistant than electroplated diamond bit, provide very high efficiency, cuts faster, durable and sturdy; U-groove tooth shape, cut sharper, help for chip removal. Machine:Compatible with most angle grinder/driller, use the adapter to switch freely between the two machines. Please do not use impact mode if switching to equipment with impact mode. Application:Used for opening holes in Porcelain Ceramic Tile Granite Marble Stone. Package Includes:8pcs Diameter 6/8/10/12/20/35/45/68mm Diamond Hole Cutter. Due to manual measurement, please allow 1-3mm error, thank you. Due to shooting problems such as light, there will be chromatic aberration, please be careful.