Standard Pack = 1 piece(s). Cutter Diameter = 0.491 IN ; Flute Length = 1 5/16 IN ; Material = High Speed Steel ; Number of Flutes = 4 ; Overall Length = 6 1/8 IN ; Pilot Diameter = 0.328 IN ; Screw Size = 5/16 IN ; Shank Diameter = 3/8 IN ;