The Bosch HSS Step Drill Bit Set 3 pcs. (4-12, 4-20, 6-30mm) is a professional-grade drilling solution designed for smooth drilling of multiple hole diameters with a single drill bit. This versatile set includes three step drill bits, each tailored for different material thicknesses.

Key Features:

• Step Diameter Ranges: 4-12 mm, 4-20 mm, and 6-30 mm respectively
• Step Height: 4 mm increments per step
• Material: High-Speed Steel (HSS) for durability
• Shank Diameter: 6 mm with a 3-flat shank design

Each drill bit boasts a split-point tip for easy starting without the need for pre-punching. The CNC ground spiral flute optimizes chip removal, significantly reducing vibration and ensuring smooth drilling.

Additional Features:

• Axial and radial relief grinding for maximum cutting smoothness
• Laser markings for precise identification of hole diameters

This set is designed for use with rotary drills and drivers, providing a reliable drilling experience while reducing the need for frequent bit changes.