This high-quality adaptor lets professionals use large-format diamond core bits on smaller drilling machines. It converts a 1/2" BSP male thread from drill spindles or extension rods to the 1 1/4" UNC male thread required by most wet core bits 1-5/8" and larger, increasing versatility and reducing the need for extra equipment. Made from durable steel, it withstands heavy-duty drilling, while precision engineering ensures a secure, concentric fit that minimizes vibration and maximizes power transfer-an essential accessory for concrete cutting professionals.