This auger bit's solid centre design drills through soft or hard woods with ease. Built with a coarse screw point and a single-spur cutting edge to give your cuts a smoother, cleaner finish. Measures 5/8 inches in diameter with a shank size of 5/16 inches and a twist length of 4 1/2 inches for a total of 7 1/2 inches in length. Fits a I-100 power drill.