7 Pack, Hammer Drill Bit Kit, Indexed Cassette Case, Includes: 5/32'', Two 3/16'', Two 1/4'', 5/16'', & 3/8'' Bits In 6'' Lengths, For Use In Hammer Drills In Concrete, Block & Brick, Secure Grip Hammer Drill Bit, 3 Flat Shank Prevents Bit From Slipping In The Chuck, Carbide Brazed Tips To Heat Treated Steel Shanks, Flute Is Designed For Fast Removal Of The Concrete Dust From The Hole, Aiding In More Efficient Drilling Of Small Holes.