SKU: SDT-CB-EXT-12 UPC: 817482025632 Dimensions: 5" x 18" x 4" Weight: 4 lbs Steel Dragon Tools heavy-duty, multi-purpose 12-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: 12 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. Steel Dragon Tools® offers a wide variety of professional-grade tools and high-quality replacement parts. Backed by years of manufacturing excellence and coupled with the latest technology, Steel Dragon Tools products provide incredible craftsmanship at an unbeatable value.