Amazon.com: core drill extension
Steel Dragon Tools® heavy-duty, multi-purpose 36-inch core drill bit shaft extension rod for core drilling rigs. Shaft will fit most core drills and will work with wet or dry bits. Shaft extension has 1-1/4 in. x 7 threading and is hollow throughout for wet drilling. Specifications: Extension Size: 36 in. Fits wet or dry core drill bit.
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