The 30-Piece Thread Checker is a wall-mountable bolt and nut identifier designed to quickly and accurately determine thread size and pitch. Featuring 15 standard (SAE) and 15 metric (MM) sizes, this tool ensures you’ll never struggle to find the right fit again. The easy-to-read labels, built-in ruler (inch & cm), and durable construction make it an essential tool for mechanics, DIYers, and professionals who work with fasteners regularly. Perfect for workshops, garages, and toolkits, this thread pitch gauge simplifies bolt and nut identification with ease.