**Powerful & Efficient Drilling:** Featuring a robust 1800W motor with dual-speed settings (1075 RPM and 2300 RPM), this core drill ensures swift and effective drilling. Capable of tackling holes up to 8 inches (200 mm) with a 1/4-7 inch threaded output shaft, it's your go-to tool for demanding projects. **Exceptional Hole Quality:** Our diamond core drilling machine offers both wet and dry drilling capabilities. The wet drilling option effectively flushes out debris and keeps the bit cool with water, significantly reducing dust and enhancing the smoothness of your holes—perfect for indoor renovations. **Enhanced Safety & Stability:** Equipped with a built-in clutch, this drill automatically halts when it encounters hard resistance, protecting both you and the machine. Plus, its water-seal-free design prevents common water seal failures, ensuring a consistent workflow without interruptions. **Durable Construction:** Designed with a lightweight yet robust aluminum body, this core drill rig stands up to wear and tear while minimizing operator fatigue. The reinforced PVC water hose is crack-resistant, and the steel output shaft guarantees precision with every use. **Comprehensive Professional Kit:** Fully equipped for your drilling needs, this concrete core drill includes four premium drill bits (1 inch, 2 inches, 3 inches, and 4 inches) that effortlessly cut through reinforced concrete, brick, marble, and more. It's the ultimate solution for all your drilling projects.