Delta 15-603 7-Piece 1/4-Inch to 1-Inch Forstner Bit Assortment Includes 7 bits (1/4-inch, 3/8-inch, 1/2-inch, 5/8-inch, 3/4-inch, 7/8-inch and 1 dia.) in a plastic case 3/8-inch Shank; Overall Length of 3-1/2-inch