1-1/16" x 23" Simpson MDMX10623Q SDS-Max Shank Quad Head BitThe Simpson Strong Tie MDMX10623Q is a heavy duty SDS Max shank rotary hammer bit designed for efficient drilling into concrete and masonry. With a 1 1 16" diameter and 23" length, this quad head bit offers extended reach and clean boreholes for anchoring, mechanical, or electrical installs. The carbide quad cutting head and aggressive flute design improve drilling speed while reducing vibration and wear. Ideal for use with SDS Max rotary hammers,