7/8 UNIT-BIT SINGLE HOLE - Irwin

The Irwin 10311ZR 7/8 UNIT-BIT SINGLE HOLE is a professional-grade UNIBIT step drill bit engineered for creating precise 7/8-inch diameter holes in a variety of thin materials. Designed for efficiency and durability, this tool is an essential addition for automotive technicians, industrial mechanics, and fabricators requiring consistent, clean hole drilling. Its specialized construction ensures reliable performance in demanding professional environments.

Key Features

• Precise 7/8-inch Hole: Specifically designed to drill a single, accurate 7/8-inch diameter hole, eliminating the need to change bits for this common size.
• Single Flute Cutting Edge: Features a unique single flute design that ensures perfectly round holes with excellent control and minimal vibration, especially in sheet metal.
• Self-Starting SpeedPoint Tip: The SpeedPoint tip facilitates fast, clean starts and prevents "walking" on the material surface, allowing for immediate and accurate drilling without the need for a pilot hole in most applications.
• High-Speed Steel (HSS) Construction: Manufactured from industrial-grade high-speed steel, offering robust durability and wear resistance for extended tool life in various ferrous and non-ferrous materials.
• 3/8-inch Hex Shank: Equipped with a 3/8-inch hex shank, which securely locks into drill chucks to prevent slippage during high-torque applications.

Applications

This Irwin UNIBIT step drill bit is ideal for drilling clean, true holes in a wide range of thin materials commonly encountered by professional technicians and mechanics. It performs exceptionally well in mild steel, stainless steel, copper, brass, aluminum, plastic, plexiglass, wood, and laminates. Common use cases include creating holes for wiring, conduit, and fasteners in electrical panels and enclosures, automotive bodywork, HVAC installations, and general metal fabrication where a consistent 7/8-inch hole is required.

Specifications

• Manufacturer: Irwin
• Model Number: 10311ZR
• Product Name: 7/8 UNIT-BIT SINGLE HOLE
• Drill Diameter: 7/8 inch
• Shank Size: 3/8 inch
• Shank Type: Hex
• Material: High-Speed Steel (HSS)
• Number of Hole Sizes: 1
• Finish: Bright or Black Oxide (HSS)