Product Description This IRWIN 29-Piece Titanium Nitride Coated Drill Bit Set includes drill bits with Titanium Nitride coating that reduces friction and withstands heat, lengthening the life of the cutting edge and keeping it sharp. These drill bits are designed for repetitive metal drilling with portable drills and stationary drill presses. The 135° split-point tip on each step drill bit starts drilling immediately and helps eliminate walking. Amazon.com The Irwin 29-Piece Titanium Metal Index Drill Bit Set is ideal for drilling wood, metal, or plastic. Built from titanium metal, this set offers the best heat resistance for drilling hard and abrasive materials, and is built extra hard for greater durability. This titanium nitride coating extends the cutting edge life up to 6 times that of a normal drill bit. Each bit comes with a 135-degree split point tip that starts on contact and cuts with less force. The reduced shank above 3/8-inches allows the use of larger drill bits in a 3/8-inch chuck, while removable cartridges make it easy to carry bits from case to the worksite. Additionally, this set includes a tap and drill selection chart for convenient reference, as well as a rubber over-molded case that protects kit if dropped. What's in the Box 29 drill bits: 1/16-inch to 1/2-inch bits in 1/64-inch increments, and a rubber-overmolded case that protects the kit if dropped. From the Manufacturer Irwin Industrial Tools 3018003 29-Piece Drill Bit Industrial Set Case, Tin coated. Irwin offers a complete line of Metal Twist Drill Bits, including Black Oxide, Turbo Point, Titanium Nitride and Cobalt Drill Bits. See more