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1.You will receive a comprehensive, professional 52-piece thread gauge set designed for ultimate versatility. This complete kit includes both Metric and Imperial measurement standards, covering a wide range of 60° (ISO/Unified) and 55° (Whitworth/BSW) thread profiles. 2.Each gauge blade is precision-manufactured from hardened, heat-treated steel. This high-quality material ensures exceptional durability, wear resistance, and long-term measurement accuracy, protecting against bending or damage during frequent use in demanding industrial environments. 3.The set features a compact, fold-out metal case that securely organizes all 52 serrated checker blades for easy portability and quick access. Each blade is clearly laser-etched with its specific thread pitch size, ensuring instant, unambiguous reading. The serrated edges provide a positive grip on fasteners for stable and accurate pitch comparison. 4.This tool is indispensable for machinists, mechanics, engineers, quality control inspectors, and skilled DIYers. Its primary function is to accurately measure and identify the thread pitch (T.P.I. or mm pitch) of nuts, bolts, screws, and fittings. It is critical for workshop maintenance, machinery repair, manufacturing, assembly verification. 5.Thank you for trusting our precision measurement tools. We are confident this set will become a reliable asset in your workshop. Our dedicated customer support team is committed to your complete satisfaction and is ready to assist with any questions. We truly appreciate your business.