MAGBIT 728.1016 MAG728 5/8-Inch by 40-Inch Timber Bit Designed to work with pneumatic and hydraulic drill motors as well as standard and quick change chucks Back tapered to prevent binding in deep holes Machined on a true center to prevent "wandering" in the work piece Double flute, double spur for clean holes and quick chip removal Designed to cut deep holes in large timbers such as log homes, docks and bulkheads