Step Drill 1/4 Inch - 3/4 Inch - Unibit

The Unibit UN3P Step Drill delivers a precise and burr-free solution for professional technicians working with thin sheet metals and plastics. Engineered from TiN-coated HSS with a 1/4" hex shank, this durable tool ensures consistent performance for automotive, industrial, and electrical projects in both shop and field environments. It streamlines operations by covering commonly used hole sizes from 1/4" to 3/4".

Key Features

• 1/4"–3/4" Step Range: This single step drill streamlines operations by covering the most frequently used hole sizes, ideal for panel work, electrical knockouts, and bracket mounting.
• TiN-Coated High-Speed Steel (HSS): The robust HSS body with a Titanium Nitride (TiN) surface treatment enhances wear resistance and reduces friction, extending tool life in demanding professional use.
• Self-Starting, Non-Walk Tip: Designed to initiate drilling cleanly on painted, coated, or curved surfaces without requiring a pilot hole, preventing 'walking' on fenders, inner panels, and sheet metal skins.
• Dual Spiral Flutes: Optimized for efficient chip evacuation, these flutes help manage heat buildup during operation, resulting in smoother, rounder holes in thin-gauge materials.
• Laser-Etched Step Markings: Permanent size indications remain legible through repeated use and resharpening, ensuring quick and accurate size identification throughout the tool's lifespan.
• 1/4" Hex Shank: Provides a secure grip in standard drill chucks and impact drivers, suitable for mobile work on passenger vehicles, light trucks, and fleet equipment.

Applications

This professional-grade step drill is primarily utilized for automotive body and upfit work, including enlarging existing holes or creating new mounting points in fenders, inner structures, and brackets on cars, pickups, vans, and service trucks. It also serves effectively in electrical installations for conduit and knockout sizing in control panels and junction boxes, as well as for HVAC and plumbing cutouts in thin sheet metal. Suitable materials include aluminum, copper, mild steel, light-gauge stainless steel, various plastics, PVC, and laminates.

Specifications

• Manufacturer: Unibit
• Model: UN3P
• Drill Size Range: 1/4" to 3/4"
• Material: High-Speed Steel (HSS) with Titanium Nitride (TiN) coating
• Shank: 1/4" hex
• Weight: 0.15 lb