Extreme durability: Thicker web provides greater strength and longer life Fast, accurate drilling: 135° split point tip starts on contact to prevent walking, while the parabolic flute clears chips fast Reduced slipping: 3-Flat Secure-Grip™ shank holds the bit firmly in the drill chuck Corrosion resistant: Black oxide coating provides lubricity and resists corrosion of the bit Coating-Black Oxide Includes (1) 1/16″ Thunderbolt Black Oxide Drill Bit (1) 11/64″ Thunderbolt Black Oxide Drill Bit (1) 13/64″ Thunderbolt Black Oxide Drill Bit (1) 1/4″ Thunderbolt Black Oxide Drill Bit (1) 3/16″ Thunderbolt Black Oxide Drill Bit (1) 3/32″ Thunderbolt Black Oxide Drill Bit (1) 3/8″ Thunderbolt Black Oxide Drill Bit (1) 5/16″ Thunderbolt Black Oxide Drill Bit (1) 5/32″ Thunderbolt Black Oxide Drill Bit (1) 5/64″ Thunderbolt Black Oxide Drill Bit (1) 7/32″ Thunderbolt Black Oxide Drill Bit (1) 7/64″ Thunderbolt Black Oxide Drill Bit (1) 1/8″ Thunderbolt Black Oxide Drill Bit (1) 9/32″ Thunderbolt Black Oxide Drill Bit (1) 9/64″ Thunderbolt Black Oxide Drill Bit