HELLER TOOLS 325059 HSS-Co Stepstar 7-Piece Twist Drill Bit Set DIN 338, 2-10 mm, Split Point, Metal

This 7-piece twist drill bit set from the HELLER TOOLS Stepstar series is engineered for precision drilling in tough metals. The HSS-Co construction with 5% cobalt delivers high heat resistance and durability, while the 135° split point ensures self-centering and reduces walking on the workpiece.

Advantages

Each bit is precision ground to DIN 338 with an h8 shank tolerance for accurate hole sizing. The split point geometry allows for faster penetration and less thrust pressure, making it ideal for both handheld drills and stationary machines. The bright, uncoated surface promotes efficient chip removal and is suitable for a wide range of materials.

Suitable for

• Alloyed and unalloyed steel
• Stainless steel (INOX)
• Cast iron
• Non-ferrous metals
• Plastics

Key specifications

• Material: HSS-Co (5% cobalt high speed steel)
• Standard: DIN 338
• Number of pieces: 7
• Drill bit type: Twist drill bit
• Point angle: 135° split point (DIN 1412 C)
• Shank type: Cylindrical
• Surface finish: Bright / uncoated
• Manufacturing process: Precision ground
• Tolerance: h8
• Set contents: 2.0 mm, 3.0 mm, 4.0 mm, 5.0 mm, 6.0 mm, 8.0 mm, 10.0 mm
• Packaging: Robust plastic cassette

Recommendations

For best results, use cutting oil when drilling stainless steel or cast iron. The split point eliminates the need for center punching in most applications.