Ingco 4-Piece Professional HSS 4341 Step Drill Bit Set with Automatic Center Punch - High-Speed Conical Core Drill Bits for Sheet Metal and Plastic (AKSDS2041)

Drilling clean, perfectly round holes of varying diameters in sheet metal, electrical junction boxes, or aluminum panels using traditional twist drill bits is an exhausting and inefficient task. Standard bits often skate across surfaces, burr the edges, or catch violently, leading to warped metal sheets and broken tooling. The Ingco AKSDS2041 4-Piece High-Speed Steel (HSS) Step Drill Bit Set is an industrial-grade metalworking solution engineered to deburr, chamfer, and drill multiple hole sizes smoothly with a single bit. Outfitted with an optimized dual-flute geometry and an essential automatic center punch, this premium kit allows commercial electricians, HVAC technicians, and metal fabricators to breeze through thin metals and plastics with absolute precision and speed.

The exceptional cutting speed and extreme durability of these step bits stem from their premium HSS 4341 steel construction. This high-performance alloy retains structural sharpness and resists heat buildup during high-RPM operations, ensuring long-lasting performance. Each step features crisp, laser-etched metric size markings that remain completely readable even after heavy use, ensuring flawless depth control. Before drilling, the included automatic center punch allows you to make precise, high-impact dimples on your workspace, keeping the drill bits perfectly centered and completely eliminating tool skating. Designed with a non-slip tri-flat shank configuration, these bits lock securely into standard 13mm keyless chucks to deliver maximum torque transfer without spinning.

Key Features

• Premium HSS 4341 Core Build – High-Speed Steel composition provides excellent wear resistance and thermal resilience when cutting through tough sheets.

• 4-Piece Complete Master Pack – Includes 3 separate metric multi-step cone drills paired with a high-impact automatic center punch for an all-in-one setup.

• Heavy-Duty Automatic Center Punch – Delivers an automatic spring-driven blow when pressed against surfaces, ensuring precise markings to prevent drill bit slippage.

• Efficient Dual-Flute Geometry – Two-flute cutting layout clears metal filings rapidly, ensuring smoother drilling action and dramatically cleaner, burr-free edges.

• Secure Tri-Flat Shank Design – Machined three-sided flat shanks lock firmly into standard drill chucks, completely preventing slipping under high loads.

• Rugged Plastic Storage Box – Conveniently supplied in a heavy-duty custom-fit storage case for organized stock tracking, clean presentation, and easy tool room portability.

Technical Specifications

• Brand: INGCO

• Model: AKSDS2041

• Product Type: Professional Metric Conical Step Drill Bit & Punch Set

• Total Piece Count: 4 Pieces Included (3 Step Bits + 1 Center Punch)

• Metric Sizing Steps Breakdowns:

  • Bit 1 (5 Steps): 4-12mm (2mm per step: 4, 6, 8, 10, 12mm)

  • Bit 2 (9 Steps): 4-20mm (2mm per step: 4, 6, 8, 10, 12, 14, 16, 18, 20mm)

  • Bit 3 (15 Steps): 4-32mm (2mm per step: 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32mm)

• Accessory Component: 1 × Heavy-Duty Automatic Center Punch

• Material Composition Matrix: Premium-Grade HSS 4341 High-Speed Steel

• Shank Interface Layout: Tri-Flat Triangular Power Tool Shank

• Primary Machine Compatibility: Fits corded and cordless 20V rotary drills, impact drivers (via chuck adapters), and benchtop drill presses

• Primary Target Substrates: Thin structural steel sheets, sheet iron, aluminum plates, copper profiles, brass fittings, PVC panels, wood boards, and acrylics (up to 4mm thickness)

• Primary Applications: Enlarging electrical knockouts, clean pipe channel routing, automotive custom panel fabrication, cabinetry cable management, and HVAC duct modification

Ideal For

Commercial electricians, HVAC duct installers, auto body fabricators, maintenance mechanics, and DIY craftspeople who need a fast, versatile, and chatter-free multi-stage drilling set to cut clean holes in thin panels.

Package Includes

3 × HSS 4341 Metric Step Drill Bits (4-12mm / 4-20mm / 4-32mm)

1 × Heavy-Duty Automatic Center Punch

1 × Fitted Rugged Plastic Storage Box Package Case Layout