Single-fluted design eliminates skidding and makes for easier resharpening. Laser-etched hole sizes are easy-to-read and permanent. Anti-skid tip eliminates the need for center punching or pilot drilling for most sizes. Drill multiple-size holes in thin metal, plastic, and wood using a single bit. 59003 Unibit, 1/8” deep steps, 3/8” shank, 9 sizes in 1/16” increments from 1/4" to 3/4".