🔧 Elevate Your Efficiency with Every Thread Check! Crafted from premium high-speed steel for durability. Permanently engraved sizes for instant identification. Innovative wire loop design prevents loss of pieces. Includes a comprehensive range of metric and SAE sizes. Quickly verify thread sizes with ease. Engraved Measurements High Speed Steel Complete Size Range The Nut and Bolt Thread Checker is a high-speed steel tool designed for accurate verification of both standard and metric thread sizes. With a durable construction, smart storage features, and permanently engraved measurements, it’s the perfect companion for professionals in construction, engineering, and technical fields.