Step Drill Bit Set for Metal Metric 4 32 M35HSS Cobalt Titanium Cone Drilling Holes Spiral Flute Drill Hex Woodworking Tools

Product Overview: The Professional's Choice for Clean, Versatile Drilling

Tired of cluttering your toolbox with dozens of single-size drill bits? Our 3-Piece Step Drill Bit Set is engineered for efficiency, precision, and durability. Designed for both professional tradespeople and serious DIY enthusiasts, this set handles everything from delicate electrical work to robust metal fabrication. Made from premium German-grade steel with an advanced coating, it's built to meet the high standards of European workshops.

Technical Specifications & Features

Set Contents: 3 x Step Drill Bits

Size Ranges: 4-12mm, 4-20mm, 4-32mm

Material: High-Speed Steel (HSS) M35 Cobalt (5% Cobalt)

Surface Treatment: Golden Titanium Nitride (TiN) Coating

Shank: 1/4" (6.35mm) Hex Shank

Flute Design: Spiral Flute

Why Our Step Drill Bits Are Superior

M35 Cobalt HSS Core:Unlike standard HSS, the addition of 5% Cobalt significantly increases red-hardness, allowing the bit to retain its hardness and sharpness even at high temperatures generated when drilling stainless steel or hard metals.

TiN Coating:The golden Titanium Nitride coating reduces friction, increases surface hardness (up to 80 HRC), and provides exceptional wear resistance, resulting in a 3-5x longer lifespan than uncoated bits.

Spiral Flute Design:Ensures efficient chip evacuation, preventing clogging in the hole. This leads to a smoother drilling process, less heat buildup, and a cleaner, more precise finish.

Anti-Slip Hex Shank: Fits securely into all standard ¼" drill chucks (including impact drivers) without slipping, even under high torque.

Multi-Steps & Laser Etching: Each step is precision-ground to a specific diameter and clearly laser-etched for easy and accurate size identification.

How to Use: A Step-by-Step Guide for Optimal Results

1.Safety First! Always wear safety glasses and gloves.

2.Mark & Secure: Clearly mark the center of your hole. Secure the workpiece firmly in a vice or with clamps.

3.Pilot Hole (Recommended for Metals): For a easier start and longer bit life, begin with a small pilot hole (3-4mm) using a standard twist drill bit.

4.Start Drilling: Place the tip of the step drill bit into the pilot hole or on your marked spot. Hold the drill perpendicular to the surface.

5.Apply Steady Pressure: Start at a low to medium speed. Apply firm, steady pressure. Let the bit do the work – do not force it.

6.Progress & Clear Chips: Drill until the first step reaches the desired diameter. To enlarge the hole, continue to the next step. You may pull out the bit occasionally to clear chips, especially in deep holes.

7.Cooling: For prolonged drilling in metal, use a suitable cutting fluid to cool the bit and improve performance.