Standard Pack = 1 piece(s). Bar Diameter = 5/8 inch ; Head Diameter = 2 1/2 inch ; Hole Diameter = 5/8 inch ; Hole Spacing = 3/4 inch ; Offset or Travel = 3/4 inch ; Overall Length = 7 3/16 inch ; Shank Diameter = R-8 ; Shank Length = 4 inch ; Shank Style = R-8 Shank ; Type = Boring Head With Integrated Shank ;