Heleta's thick walled Carbide Tipped Masonry Core Bits are ideal for large hole drilling through concrete (not recommended for steel) and masonry using a Rotary Hammer Drill. Our carbide tipped core bits are widely used by plumbing, electrical and mechanical contractors in applications such as drilling for railing installations, through wall drilling for electrical conduit, plumbing and sanitary pipe and relocating anchors using chemical anchoring systems or grout-in-place anchors. Specialty applications include pest control as well as rigging and firestop systems. Reusable shanks for SDS-Plus, SDS-Max and Spline hammer drills are available separately. No reason to buy another shank with each core bit like some other integrated designs.