The Precision Hex Driver from Park Tool is a professional quality hex driver available in 2, 2. 5, and 3mm Allen hex sizes. With such small hexes, you'll quickly appreciate that those tips are precision machined to exacting standards for a snug fit that prevents rounding. Its handle is CNC machined from 6061 aluminum for ergonomics and balance and makes tightening or loosening bolts super easy. Additionally, the handles get color-coded anodization and are laser engraved for easy identification on your workbench or in the toolbox.