Precision shear bits bore smooth, flat-bottomed holes. Serrated design produces a unique butting edge for less splintering and chipping. Hardened steel for longer life. Ultra sharp spur insures accurate hole and resists walking on material. 3-1/2 In. length. 3/8 In. shank. Includes: 1/4 In., 1/2 In., 3/4 In., and 1 In. bits.