Greenlee GSB12 1-3/8" Step Bit Multi-Hole Metal Cutter with Split-Point Design

Greenlee GSB12 1-3/8" Step Bit Multi-Hole Metal Cutter with Split-Point Design

Professional Multi-Stage Drilling for Metal, Wood & Composite Materials

The Greenlee GSB12 1-3/8" Step Bit delivers professional-grade drilling performance across multiple materials including mild steel, aluminum, brass, copper, wood, fiberglass, plastics and laminates. This 4-stage step bit features patented split-step design and durable split-point tip construction for reliable penetration and efficient cutting in demanding applications.

Professional Features & Benefits

• 1-3/8" Maximum Capacity: Handles drilling requirements from 3/16" to 1-3/8" diameter in a single tool for versatile job site efficiency
• 4-Stage Progressive Design: Multiple drill stages optimize chip load distribution for faster cutting speeds and extended tool life
• Split-Point Tip Construction: Durable tip design ensures fast, accurate material penetration while minimizing walking and drilling effort
• Three-Flat Shank Design: Universal compatibility with all 1/2" drill chucks provides secure grip and prevents slipping during operation
• Double Flute Configuration: Improved chip evacuation design maximizes cutting speeds and reduces heat buildup for consistent performance
• 10 Gauge Sheet Metal Rating: Handles up to 3.5mm thick sheet metal applications with reliable cutting performance
• USA Manufacturing: Domestic production ensures consistent quality standards and reliable supply chain support

Technical Specifications

• Country Of Origin: United States
• Maximum Drill Diameter: 1/8" (3.2 mm)
• Maximum Sheet Metal Thickness: 10 gauge (3.5 mm)
• Minimum Drill Diameter: 3/16" (4.8 mm)
• Number Of Drill Stages: 4
• Product Type: Multi-hole Step Bit

Installation & Operation

1. Mount the step bit securely in a 1/2" drill chuck using the three-flat shank design for optimal grip.
2. Mark the desired hole location and center punch for accurate starting point positioning.
3. Begin drilling at low speed with light pressure, allowing the split-point tip to establish proper penetration.
4. Maintain steady feed rate as the progressive cutting edges engage each drilling stage sequentially.
5. Monitor chip evacuation through the double flute design and clear debris as needed for optimal performance.
6. Complete drilling to desired diameter stage and withdraw bit while motor is still running to prevent binding.

Professional Applications

• Electrical Panel Installation
• HVAC Ductwork Fabrication
• Metal Fabrication Shops
• Automotive Repair Services
• Plumbing System Installation
• Industrial Maintenance Operations
• Construction Site Drilling

Why Choose Greenlee Quality?

Greenlee GSB12 step bits combine USA manufacturing standards with patented split-step technology for reliable performance across multiple materials. The laser-marked sizing ensures quick identification while the progressive cutting edge design maximizes torque efficiency and minimizes power tool stalling for consistent professional results.