Step Drill Bit Set 3pcs 4-12 4-20 4-30

Step Drill Bit Set (3-Piece)

Included Sizes:

• 4–12mm (9 steps)

• 4–20mm (9 steps)

• 4–32mm (15 steps)

Features:

• Wide Range Sizes for Industrial Use: Three common sizes to cover various hole diameter needs for daily and professional tasks.

• Tapered Step Design: Gradually enlarges hole diameters with natural chamfering, no need for extra deburring tools.

• Material Upgrade – Cobalt HSS with Titanium Coating: High hardness, sharp and wear-resistant for long service life and high drilling precision.

• 118° Split Point Tip: Ensures self-centering, minimizes walking and wobbling, and creates clean holes.

• Straight Flute & Hex Shank: Efficient chip removal. Standard 6.35mm (1/4″) hex shank fits power drills and drivers securely.

Applications:
Perfect for drilling into cast copper, aluminum, wood, plastic, and bamboo.