7 Piece, Premium Percussion Masonry Drill Bit Set Innovative Tip Configuration Reduces Walking For Improved Accuracy, Improved Carbide Tip Provides Up To 2 Times Longer Life, Optimum Grade Of Carbide Provides Maximum Durability, Unique Flute Design Efficiently Removes Dust Reducing Bit Binding, Used By General Contractors, Electricians, Mechanical Contractors, Among Others For A Wide Variety Of Fastening Applications Such As Commercial Shutters, Gutters, Railings & Duct Work Installation, Drilling Holes Up To 1" For Mechanical Anchors & Small Diameter Through Holes, Drilling Smaller Diameter Holes In Soft Aggregate Materials, Contains 1 Each: Carbide Hammer Drill Bits In Sizes 3/16" x 3, 1/4" x 4", 5/16" x 6", 3/8" x 6", 1/2" x 6" & 2 1/4" x 6" Carbide Hammer Drill Bits.