Drill America 3/8 x 4 Carbide Tipped Masonry Drill Bit
 
Designed for drilling in brick, concrete and sandstone
For use in portable electric drills.
Engineered with wide flutes to provide fast dust removal in softer materials
Round shank for use in a wide range of tool holding systems
Carbide tips brazed to tough steel bodies and are larger than the nominal drill size to provide clearance for installation of anchor screws, expansion shields and toggle bolts