The Do it Best 8-Piece Spade Bit Set is crafted from high carbon steel with heat-treated tips for enhanced durability and precision. Featuring a universal quick change design, this set provides reliable performance for fast and efficient drilling across various materials. 8-Piece set includes (1) of each: 3/8", 9/16", 1/2", 5/8", 11/16", 3/4", 7/8" and 1".