Irwin Unibits are Step Drill Bits. Sizes Start 1/8" to 1/2", 1/4" to 3/4", 3/16" to 7/8", 1/4" to 1-3/8" Multi Step Drills, Vari-Bit, Uni Bit, Lenox, and Irwin are some of the Step Drill Bits that we carry. We have sets of step drill bits and made in the usa step drivers. We have quick change hex adaptors for 1/4" hex shank and 3/8" hex shank. Many of the Step drills have quick change capabilities but some step drills do not.
