Core Center Bit: SDS Max Shank, 3 1/4 in Core Dia, 12 in Overall Lg, Centering Bit Included

DEWALT MODEL DW5920, These one-piece core bits have an SDS-Max 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 SDS-Max chucks, and they can be changed in the chucks with one hand. SDS-Max chucks have spring-loaded balls that fit into the grooves on the bits' shanks to hold the bits in place in the chucks.