Irwin 4935643 Jobber Length Drill Bit Set 12 Pc

Product Description

The IRWIN 4935643 is a 12-piece jobber length drill bit set covering sizes from 0.0625 inches (1/16 inch) to 0.25 inches (1/4 inch) in 12 individual hole sizes. Each bit is machined from high speed steel with a carbon steel oxide finish that reduces friction and helps resist wear during repeated use. Jobber length geometry provides a balanced combination of reach and rigidity, making these bits practical for general metalworking and multipurpose drilling tasks. Licensed tradespeople and experienced DIYers working in HVAC, plumbing, electrical, or general construction will find this set covers the most commonly called-for fractional bit sizes in a single package.

This set is suited for metalworking applications including drilling sheet metal, light structural steel, and other ferrous and non-ferrous materials encountered in residential and light commercial trade work. The inch-based sizing system follows ANSI specification designations, making it a straightforward fit for standard trade workflows. The 12-step size progression means fewer changes between closely spaced hole diameters, which improves efficiency on multi-hole layouts.

Key Features

• 12-piece set spanning 0.0625 inches to 0.25 inches in 12 individual sizes
• High speed steel construction with carbon steel oxide coating for reduced friction and improved wear resistance
• Jobber length geometry balances reach with bit stiffness for cleaner holes
• ANSI specification designation for consistent sizing and fit with standard chucks
• Inch-based measurement system compatible with common trade layouts and callouts
• No coolant-through requirement simplifies use with standard hand drills and drill presses

Compatibility

Designed as a general-purpose jobber length drill bit set for metalworking and multipurpose drilling applications using standard 3-jaw chucks that accept bits up to 0.25 inches in diameter.

Installation Notes

Install bits should be performed by a qualified tradesperson familiar with rotary cutting tool safety. Ensure the drill or drill press is powered off and unplugged before changing bits and verify the chuck is fully tightened before operation. Use appropriate cutting fluid when drilling harder metals to extend bit life. Always wear eye protection and secure the workpiece before drilling.