Inton 3/8" Shank Titanium Step Drill Bit, 1/4' to 1-3/8' in 1/8' Increments with SafePlastic Case|10 Steps SUPER STRONG: Made of high speed steel and titanium coated for added durability and bit life MULTIPLE DRILL SIZES WITH ONE BIT: 1/4, 3/8, 1/2, 5/8, 3/4, 7/8, 1, 1-1/8, 1-1/4, 1-3/8-inch VERSATILE AND FAST: 3/8" 3-flat shank prevents slippage when drilling new holes or enlarging existin Saves time without changing drill bits Works on plastic, wood and most metals, including steel, brass, aluminum and copper