Hammer bit set with carbide tipped blades for masonry (brick, block, concrete). For use with hammer drills. 4 flute design cleans debris out for fast, efficient drilling. 2-flute tip maximizes carbide surface contact for longer bit life. 3 flats on shank eliminate bit slipping in chuck. 5/32 in., 3/16 in., 1/4 in., 5/16 in., 3/8 in. Convenient storage case included.