Century Drill and Tool 36416 Lazer Spade Bit, 1/4-Inch 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 to eliminate wobble Made from premium quality hardened steel remains sharper longer and increases tool life Power shank fits all types of 1/4-Inch quick-change adapters 6 inch overall length