3pcs Hex Shank HSS Step Drill Bits set

Technical Data

1. Material & Coating: Made of HSS (M2 or M35 cobalt optional). Surface is often coated with Titanium Nitride (TiN) or Aluminum Titanium Nitride (AlTiN) for enhanced durability, and bright or black oxide finishes are also available.
2. Dimensions: The 3-piece set typically includes sizes 4 – 12mm, 4 – 20mm, and 4 – 32mm, with 5, 9, and 15 steps respectively. It adopts a 1/4-inch quick-change hex shank and is equipped with 2 spiral flutes, plus a 118° or 135° split point.
3. Other Specs: Suitable for drilling materials up to 5mm thick. Laser-marked size labels are available on the flutes. It is usually packed in a nylon bag, plastic box, or metal box.

Advantages

1. The hex shank ensures a firm grip, preventing slipping during drilling, and is compatible with impact drivers and standard drills for quick bit changes.
2. Spiral flutes and split points enable efficient chip evacuation and self-centering, avoiding drilling deviation without pre-punching.
3. TiN or AlTiN coatings boost wear and heat resistance, and the step design allows one bit to drill multiple hole sizes, saving tool change time.
4. The 3-piece set covers common size ranges, meeting the needs of various light and medium drilling tasks for both professionals and DIY enthusiasts.