Lazer Spade Bits advanced cutting design features arched shaped cutting spurs that define the hole, remove the chip and increase cutting speeds. Heavy duty, single construction shank provides added stability; eliminates wobble. Made from premium quality hardened steel, remains sharper longer and increases tool life. 13 Piece Set includes 1/4-Inch, 5/16-Inch, 3/8-Inch, 7/16-Inch, 1/2-Inch, 9/16-Inch, 5/8-inch, 11/16-Inch, 3/4-Inch, 13/16-Inch, 7/8-Inch, 15/16-Inch and 1-inch lazer spade bits.