PRECISE COMPATIBILITY: Effortlessly adapt 5/8"-11 male threads and 1-1/4"-7 UNC Male Thread to SDS Max Arbor, perfect for seamlessly connecting core drill bits, enhancing drilling versatility DURABLE CONSTRUCTION: The core drill bit adapter is made of high-quality hardened steel, and electrophoresis treatment makes the adapter corrosion-resistant and durable to ensure long-term stable performance SECURE AND STABLE CONNECTION: Thanks to the secure and stable connection provided by this Core Drill Bit Adapter, it ensures optimal performance and adaptation with diamond core drill bits, helping to improve the efficiency of the tool, so you can perform your drilling tasks with peace of mind and safety. EASY TO USE: These Core Drill Bit Adapter are meticulously crafted for effortless connection, ensuring your drilling tasks are smoother and more efficient. WARM TIPS: Core Drill Bit Adapter are designed for rotary mode, avoid using hammer mode, prioritize safety and performance, protect your tools and workpieces. Color: As Shown Material: Metal Package Contents: 1 Pcs 1-1/4"-7 UNC Male Thread 1 Pcs 5/8"-11 Male Thread