UNIBIT-21 13/16-1- 3/8HOLE ENLRGING - Irwin

The Irwin UNIBIT-21 Step Drill Bit is engineered for professional technicians and mechanics requiring precise and efficient hole enlargement in thin materials. This robust high-speed steel drill bit is designed to create clean, burr-free holes, making it an indispensable tool for automotive repairs, industrial fabrication, and general maintenance tasks.

Key Features

• Single-Flute Cutting Edge: Provides superior control through each step, ensuring accuracy and a true round hole with every application.
• 3-Flatted Hex Shank: Prevents slipping in the drill chuck, offering enhanced stability and user confidence during operation.
• High-Speed Steel Construction: Delivers exceptional durability and resistance to wear, ideal for demanding professional environments.
• 10-Step Design: Progressively enlarges holes from 13/16 inch to 1-3/8 inches in 1/16 inch increments.

Applications

This UNIBIT-21 is particularly suited for drilling and enlarging holes in thin gauge materials up to 1/8 inch thick. It performs exceptionally well in a variety of materials common in automotive and industrial settings, including stainless steel, copper, brass, aluminum, plastic, and laminates. Ideal for panel work, electrical installations, custom fabrication, and sheet metal applications where precise hole sizing is critical.

Specifications

• Manufacturer: Irwin
• Model Number: PE10221 (Nominal Size #21)
• Type: Fractional, Hole Enlarging Step Drill Bit
• Minimum Drill Size: 13/16 Inch
• Maximum Drill Size: 1-3/8 Inch
• Step Increment: 1/16 Inch
• Number of Sizes: 10
• Shank Type: Hex, 3-Flatted
• Shank Size: 7/16 Inch
• Material: High Speed Steel
• Maximum Material Thickness: 1/8 Inch
• Number of Flutes: 1