UNIBIT SET 4 PC HSS #1,2,3,21 - Irwin

The Irwin UNIBIT SET 4 PC HSS #1,2,4,21, model PE10225, is a professional-grade step drill bit set engineered for efficiency and durability in demanding automotive and industrial applications. This four-piece high-speed steel (HSS) set provides a comprehensive range of drilling capabilities, allowing technicians to create multiple hole sizes with a single tool. Its robust construction and intelligent design ensure precision and control, making it an essential addition to any professional toolkit.

Key Features

• Single-Flute Cutting Edge: Designed for superior control and precision, the single-flute cutting edge delivers clean, perfectly round holes in various materials.
• 3-Flatted Shank: The innovative 3-flatted shank design effectively prevents slippage within the drill chuck, ensuring stable and consistent operation even under high torque conditions.
• Non-Skid Self-Starting Tip: Featuring a non-skid, self-starting tip, these Unibits eliminate walking and the necessity for center punching, allowing for fast, accurate starts.
• High-Speed Steel Construction: Manufactured from high-speed steel, each bit in this set offers exceptional strength, heat resistance, and extended tool life, standing up to rigorous professional use.
• Versatile Sizing: This set includes Unibit sizes #1, #2, #4, and #21, providing a broad spectrum of hole-drilling capabilities. The #1 Unibit offers 13 hole sizes (1/8" to 1/2"), the #2 provides 6 hole sizes (3/16" to 1/2"), the #4 covers 12 hole sizes (3/16" to 7/8"), and the #21 is designed for 10 hole sizes (13/16" to 1-3/8") for hole enlarging.

Applications

The Irwin UNIBIT SET 4 PC HSS is ideal for drilling and enlarging true, round holes with smooth finishes in a variety of thin materials. It is particularly well-suited for professional technicians working with sheet metal, metal plates, aluminum, fiberglass, plastics, and wood. Common applications include automotive bodywork, custom fabrication, electrical installations, HVAC system modifications, and general industrial maintenance where precise, clean holes are required without the need for frequent bit changes.