This 25 mm diamond core drill is ideal for creating clean holes for single-hole taps and shower hoses in porcelain and granite countertops. It features vacuum-brazed diamonds for fast cutting and an M14 thread for a direct fit to an angle grinder. An internal wax core lubricates and cools the bit, allowing for efficient dry drilling without water. This tool provides a precise, chip-free hole, simplifying the installation process and reducing the risk of material damage.