• {Core Drill Bit Adaptor Specification} Standard Core Drill Bit Adapter 1 1/4"-7 female thread to 5/8"-11 male thread.
• {High Quality} Chemical black coating on the surface of core drill bit extension for rust protection and long term preservation. High grade steel, strong and durable.
• {Wide Application} Core drill bit adaptor are designed for using core drill bits with the 5/8"-11 female threaded. General Purpose Adapter for Drilling Concrete, Granite, Brick.
• {Drilling method} Suitable for 1-1/4”-7 thread core drill machines. Using core bits threaded at 5/8"-11 on a core drill machine threaded at 1-1/4"-7. Work both dry and wet with core drill.
• 【 Meet Your Needs 】 Use a 1 1/4 "-7 Female to 5/8" -11 Male adapter according to your actual needs, making it more convenient for your device to use. B0CG3C1Q2B