2pcs Step Drill Bit Set TiALN Coated Hex Shank Two Flutes

EXTRACUT 2-Piece TiALN-Coated Step Drill Bit Set a complete multi-size drilling solution in a compact, portable package. This set combines two complementary step drill bits with overlapping size ranges to cover virtually every common hole size from Ø4mm to Ø40mm using just two tools. Both bits feature TiALN coating for maximum durability and 1/4" hex shanks for use in cordless impact drivers, drill presses, and handheld power drills.

Key Features

• Complete Size Coverage — Two-bit set covers Ø4mm – Ø40mm (5/32" – 1-9/16") with overlapping ranges ensuring every size between is achievable.
• TiALN Coating on Both Bits — Both pieces feature Titanium Aluminum Nitride coating for 800°C oxidation resistance and 3–5× tool life extension vs uncoated HSS.
• 1/4" Hex Shank Universal Fit — Standard 1/4" hex shank works in all cordless impact drivers, drill drivers, and drill presses without adapters.
• Complementary Step Patterns — Bit A covers small-medium range (fine steps); Bit B covers medium-large range (coarse steps) — together they fill all gaps.
• Laser-Etched Size Markings — Every step diameter is clearly marked for instant size selection without trial-and-error.
• Compact Storage Case — Included durable case protects both bits and fits easily in tool bags, pouches, and vehicle storage compartments.

Applications

Electricians (conduit, panel, junction box holes of all sizes), HVAC technicians (round duct, refrigeration line, drain pan holes), automotive technicians (body panel, exhaust, wiring holes), sheet metal workers, boat builders, RV/camper modifiers, and general contractors who need a versatile, compact drilling solution for field work.

Specifications