Nut and Bolt Thread Checkers

20-Piece Metric Thread Checker is designed for fast and accurate identification of metric fasteners. Covering sizes from M3 to M24, this set ensures you’ll have the right gauge for nearly every metric nut and bolt. Each piece is CNC-machined from aircraft-grade aluminum with laser-etched markings that never fade. Built compact and durable, this kit is a must-have for mechanics, engineers, and DIYers who work with metric hardware on a daily basis.

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