Irwin UNIBIT 3 Piece Step Drill Sets

• Includes:(1) Each of Sizes: #1, #2, #3
• Specialty step drill designed to machine a large number of different hole diameters with a single tool.
• Single cutting edge creates perfectly round holes in metal, plastic, and wood without center punching.
• For use with thin materials.
• Two general variations are available for either self-starting holes or for enlarging existing holes.
• Single flute design helps to ensure perfectly round holes in a wide range of ferrous, non-ferrous and non-metallic materials.

Features:

• Right hand (clockwise rotation) cutting direction.
• Multi-step design with progressively larger holes.
• Self-starting or hole enlarging styles.
• Single Flute.
• Hardness:58 to 60 RC