Simpson Strong-Tie MDMX13723Q 1-3/8 in. x 23 in. SDS-max® Shank Quad-Head Drill Bit Concrete Screws and (6) STN22 hex-head washers

and (6) STN22 hex-head washers (sold separately)

5M Designed for 1/4-20 x 2 hex washer head specialty self drill screws w/bonded washer dagger-guard

Quick and easy to install with included brackets and screws

Category Tree (Computed): Carbide Drill Bits for Concrete and Masonry > > Core Bit

Simpson Strong-Tie MDMX13723Q 1-3/8 in. x 23 in. SDS-max® Shank Quad-Head Drill Bit Concrete Screws and (6) STN22 hex-head washersSimpson Strong Tie MDMX13723Q 1 3 8 in. x 23 in. SDS max Shank Quad Head Drill Bit Simpson Strong Tie offers a complete line of premium quality drill bits, core bits and chisels to handle any drilling and demolition need. SDS max shank bits have a chisel shaped drill bit head which penetrates the material and directs concrete dust into the multi flute spiral. The proprietary flute geometry reduces vibration and optimizes impact energy transfers from