Feature: 1. Extended Compatibility: This concrete core bit adapter converter seamlessly fits from 1 1/4in UNC male threads to 5 slot shanks, allowing effortless connection of core drill bits. Enjoy efficient drilling capabilities without the hassle of incompatible attachments. 2. Enhanced Durability: Constructed from excellent carbon steel material, the concrete core drill adapter is designed to withstand rigorous use, ensuring long term stability and performance even in demanding drilling conditions. 3. User Friendly Design: The core drill shaft adapter features an easy to use design that simplifies your drilling process. It is engineered for straightforward connections, allowing you to focusing on your work with slick and efficient manipulation, making it suitable for both handcraft enthusiasts and professionals. 4. Safe And Stable Connection: Thanks to the secure and stable connection provided by this concrete coring drill bit adapter, you can perform drilling tasks with confidence. Its design prioritizes safety, allowing you to execute your projects without worry, ensuring improved worksite reliability. 5. Good Performance: Specifically designed for use in rotary mode, this 1 1/4in UNC core drill bit adapter helps guard your tools and workpieces by avoiding hammering action. By prioritizing safety and performance, it maximizes the effectiveness of your core drill bits, ensuring optimal drilling conditions. Specification: Item Type: Concrete Coring Drill Bit Adapter Material: Carbon Steel Shank Specification: 5 Slots Thread Specification: 1 1/4in UNC Male Thread. Package List: 1 x Concrete Coring Drill Bit Adapter