Bosch Carbide Core Bit, 3-9/16" Dia. X 22" Spline, Dry Application, 17" Drilling Depth

These one-piece core bits have a spline shank that prevents the bits from slipping in high-torque drilling applications when creating large, shallow holes in concrete, masonry, and limestone. The bits install into compatible rotary hammer drills with spline-drive chucks, which have 12 grooves that mesh with grooves on the bits' shanks to hold them in place in the chucks. The bits are secured with a retaining pin.