Take the guesswork out of drilling with this GRIP(R) 3 Piece Step Drill Bit Set, which includes three pieces of varying lengths to provide the right depth for the job. Each drill bit is made of tough as nails steel coated with titanium for longer life. Includes: 1 pc 3/16" to 1/2" six step bit, 1 pc 1/4" to 3/4" nine step bit, 1 pc 1/8" to 1/2" thirteen step bit | Grip 3-Piece Step Drill Bit Set