Steel Dragon Tools heavy-duty, multi-purpose 4-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: 4 in.
• Fits wet or dry core drill bit.
• For use with most core drills.
• Threading: 1-1/4 in. x 7.
• Extensions are hollow to allow for wet drilling.