20 8 HOLE SIZES (9/16"-1") UNIBIT STEP DRILL - Vise-Grip

The Vise-Grip 10220CB Unibit Step Drill is an indispensable tool for professional technicians requiring precise and efficient hole sizing in various thin materials. This versatile drill bit integrates eight common drilling sizes, from 9/16" up to a full 1" unibit diameter, significantly streamlining operations by minimizing the need for multiple individual drill bits and frequent tool changes. It consistently delivers clean, accurate holes for a wide array of automotive, fleet, and industrial fabrication tasks.

Key Features

• Eight-in-One Versatility: Offers a comprehensive range of 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", and 1" unibit diameters, providing extensive drilling capabilities without swapping tools.
• Professional-Grade Durability: Constructed from M35 grade Cobalt High Speed Steel, this step drill is engineered for daily professional use, offering superior heat resistance, extended edge retention, and up to 6X longer life compared to standard bits.
• Precise & Clean Hole Generation: The Speedpoint™ tip ensures fast starts, while the radial concave flute and single-flute cutting edge work to produce true, round, and burr-minimized holes with enhanced control through each step.
• Secure Drilling: A 3-flatted shank design effectively prevents slippage within the drill chuck, ensuring stable and reliable operation during demanding drilling tasks.
• Clear Sizing: Laser-marked sizes on the bit body allow for quick and accurate identification of the desired hole diameter during operation.

Applications

This step drill is designed for professional mechanics and technicians working on passenger cars, light trucks, and commercial vehicles. It excels in tasks such as custom panel fabrication, mounting aftermarket lights and sensors, creating pass-throughs for wiring harnesses, and sizing holes in various brackets and guards. It is also well-suited for electrical and HVAC applications, including conduit openings, knockout sizing, and ventilation cutouts in thin metal. The tool performs exceptionally well in materials such as stainless steel, copper, brass, aluminum, plastic, and laminates, with a maximum material thickness of 1/8 inch. General shop use cases include enlarging existing holes or producing multiple diameters in dashboards, firewall panels, and utility enclosures.

Specifications

• Manufacturer: Vise-Grip
• Model Number: 10220CB
• Type: Unibit Step Drill
• Hole Sizes: 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1"
• Material: M35 Grade Cobalt High Speed Steel
• Shank Type: 3-Flatted
• Weight: 0.2 lbs.
• Dimensions: 6 x 3 x 1.5 in.