Bosch Titanium-Coated Metal Drill Bits have been designed to satisfy the needs of HVAC or facility maintenance technicians, contractors and other pros who need solid, reliable bits for general-application drilling in high-carbon steel and light-gauge metal, as well as wood and plastic. The split-point tip has been engineered for no-skate starts and clean, accurate holes. The bit provides 2X longer life than standard drill bits, thanks to the tip design and titanium coating. The three-flat shank design on bits 3/16-Inch and larger promotes better gripping and guards against slipping. Includes: (2) 1/16", (2) 5/64", (1) 3/32", (1) 7/64", (2) 1/8", (1) 9/64", (1) 5/32", (1) 11/64", (2) 3/16", (1) 13/64", (1) 7/32", (1) 15/64", (2) 1/4", (1) 5/16", (1) 3/8", (1) 1/2"