3 PCS M35 Cobalt Step Drill Bit Set with TiAlN Coating, 1/4" Hex Shank Impact Ready, 1/8" to 7/8" HSS-Co Multi-Hole Unibit with Dual-Spiral Flute for Stainless Steel, Metal, HVAC, Electrical

★★★★★ 5.0 44 reviews

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Product details

Management number 215637107 Release Date 2026/04/12 List Price $15.20 Model Number 215637107
Category
  • 【M35 COBALT & TiAlN THERMAL SHIELD】 Crafted from industrial-grade M35 Cobalt High-Speed Steel (HSS-Co) and fortified with a premium TiAlN coating. This combination withstands extreme heat up to 800°C, providing significantly longer tool life when drilling through tough materials like stainless steel and cast iron compared to standard bits.
  • 【UNIVERSAL 1/4" HEX SHANK】 Featuring a standard 1/4-inch hex shank that is "Impact Ready," allowing for quick changes and compatibility with impact drivers, electric drills, and drill presses. The hex design provides a non-slip, secure grip in the chuck, ensuring maximum torque transfer for heavy-duty tasks.
  • 【DUAL-SPIRAL FLUTE EFFICIENCY】 The advanced dual-spiral flute geometry clears metal chips 2x faster than traditional straight flutes. This efficient debris evacuation prevents clogging and minimizes friction, ensuring a smoother, cooler cutting process that protects the bit from overheating and dulling.
  • 【3-PIECE VERSATILE ASSORTMENT】 This professional set includes 3 distinct bits covering a diameter range from 1/8" to 7/8" (Bit #1: 1/8-1/2", Bit #2: 3/16-1/2", Bit #3: 3/16-7/8"). With over 30 individual step sizes, you have the exact tool needed for HVAC, electrical, and automotive maintenance.
  • 【LASER-ETCHED SIZE PRECISION】 Each bit features permanent, high-contrast laser-etched markings inside the flute. Unlike painted-on sizes that wear off, these scales stay visible for the life of the tool, ensuring you always drill the exact hole size required with professional accuracy.

Model TM24380
Brand Name TUMAX
Shank Type Hex
Unit Count 3.0 Count
Finish Types Titanium Aluminum Nitride
Manufacturer tumax
Material Type High Speed Steel (HSS)
Tool Flute Type Spiral
Number of Flutes 4
Included Components Step Drill Bit
Surface Recommendation Aluminum, Metal, Plastic, Stainless Steel

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