Product Description Product DescriptionThis IRWIN 29-Piece Black Oxide Metal Index Drill Bit Set features drill bits with a corrosion-resistant oxide treatment that helps prevent rusting. Each drill bit has a 135° split-point tip that starts on contact and cuts with less force. A reduced shank above 3/8 inch allows the use of larger drill bits in a 3/8-inch chuck. This set of IRWIN drill bits comes in a rubber, over-molded case for protection in case of drops and includes a Tap & Drill selection chart for convenient reference. Amazon.com The Irwin 29-Piece Industrial Black Oxide Drill Bit Set is a handy and versatile collection that features drill bits with 135-degree split point tips that are specially designed to let you drill effectively on contact and with less force. The reduced shank above 3/8-inch allows you to use the larger drill bits in a 3/8-inch chuck, while flatted shanks above 11/64-inch eliminate slippage in drill chuck.This set comes with automatic indexing for easy bit access and identification, a tap and drill selection chart for quick reference, and a handy rubber-overmolded case for carrying all the bits and protecting the set. The 29 drill bits feature a black oxide treatment which resists rust and corrosion, and they range in size from 1/16-inch to 1/2-inch in 1/64-inch increments.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 3018004 29-Piece Drill Bit Industrial Set Case, Black Oxide. Irwin offers a complete line of Metal Twist Drill Bits, including Black Oxide, Turbo Point, Titanium Nitride and Cobalt Drill Bits. See more