The Alpen 6pc HSS Super Jobber Drill Set features high-quality HSS twist drills with a convenient 1/4" hex shank, ideal for quick bit changes in drills or drivers. Designed for precision and efficiency when drilling alloyed carbon and plain steel. Sizes : 2.0mm, 3.0mm, 4.0mm, 5.0mm, 6.0mm, 8.0mm Brand : Alpen Special Features : 1/4" hex shank for easy bit changes HSS twist drills provide superior cutting efficiency Ideal for alloyed carbon and plain steel applications Fast and precise with durable construction