BETTERI 1-1/4"-7 Female to 5/8"-11 Male Core Drill Bit Adapter, Premium Convenient Converter for Concrete Coring & Diamond Core Bits

["Precise Thread Conversion: Easily converts 1-1/4\"-7 female threads to 5/8\"-11 male threads, allowing your core drill to work with a wider range of diamond core bits","Built to Last: Crafted from premium hardened steel for exceptional strength and wear resistance, ensuring reliable performance in tough concrete drilling conditions","Improve Drilling Accuracy: Engineered for a snug, wobble-free fit, helping you drill straighter holes with less vibration and better control","Reliable Connection: Precision-machined threads provide a tight, stable fit, preventing loosening during operation and increasing overall safety.","Time-Saving & Cost-Effective: One simple adapter gives you access to multiple bit sizes. Ideal for concrete, masonry, brick, and other hard materials. A must-have adapter for professional contractors and serious DIY users"]