Core Bit Adapters Size:1-1/4 in.-7 thread to 5/8"-11 Super thin

Super thin

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Core Bit Adapters Size:1-1/4 in.-7 thread to 5/8"-11 Super thinArcher PRO Core Bit Adapters Premium Quality Core Bit Adapters by Archer USA PRO. American designed for high performance and long life at an affordable price. Convert to accept different machine shanks Please note, large diameter core bits (2 inch and up) are designed for drill rigs. They are big and heavy. Even with adapter, your particular machine may not have enough power to drive the core bit. The proper RPM is critical to achieve maximum drilling