Proto J000AA 25-Blade Master Feeler Gauge Set - 1/2 in x 3 in Blades

Product overview

The Proto J000AA 25-Blade Master Feeler Gauge Set is a compact, durable tool built for quick, repeatable gap checks in automotive, machining, and workshop tasks. A robust steel holder keeps the 25 blades organized and protected, so you can slide it into a toolbox or pocket and be ready for checks on the go. The polished blades feel solid in hand, delivering a confident sense of precision with every use. This set prioritizes readability and practicality, offering a reliable reference when you need to confirm clearances or align components without pausing for chart lookups.

Key specs

Each blade measures 1/2 inch by 3 inches, providing a familiar handling profile for common feeler tasks. The blade range spans from 0.0015 in to 0.040 in, with the notable exception of 0.019 in. Each blade is etched with both decimal sizes and metric equivalents, enabling quick cross-reference in either system. The entire assembly weighs about 0.19 lbs, a balance of sturdiness and portability that fits into busy shop routines.

• 1/2-inch x 3-inch blades
• 25 blades included
• Sizes 0.0015 in through 0.040 in, except 0.019 in
• Blades etched with decimal and metric equivalents
• Weight 0.19 lbs
• Made in USA

Practical uses and benefits

Designed for real-world tasks, this gauge set supports quick clearance checks, gear alignment, and precise thickness readings across a range of applications. The dual markings save time when you switch between inches and millimeters, and the steel holder protects blades while keeping them easy to find. The 25-blade array covers a broad spectrum of common gaps, helping you avoid improvisation and delays in the middle of projects.

• Compact steel holder for organization and transport
• Wide size range supports many gaps
• Dual decimal and metric markings speed up readings
• Lightweight, portable, and durable for everyday workshop use
• Made in USA quality for reliable performance

Real-world scenarios include quick checks in automotive assemblies, machine tool work, and cabinetry or door hardware fittings. The etched markings on each blade reduce the need to pause and cross-reference gauges, while the sturdy build stands up to regular handling in a busy shop. While results depend on your specific task and technique, the set is designed to offer a practical, repeatable path to verifying clearances and fits.