Essential for machinists, engineers, and enthusiasts requiring reliability thread pitches verification in metalworking or equipment maintenance scenario The resistant steel construction maintains calibration integrity through repeated use, making it a fundamental measuring instrument for professional dimensionals analysis Ideal for workshop toolkit, manufacturing floor inspections, and home garage projects where quick identification of screw thread and taps is critical for precise assembly This 3piece / set features double side 60° ( 1 / 14in 1 / 32in) and 55°Whitworth scale, metric 0.5-1mm graduations, packaged in lightweight and durability for portability and scratch resistance Precise engineered steel thread gauge center gauge set with etcheds marking ensures ±30 ' angles accuracy, compliant with metric, and Whitworth standards for versatilitys thread measurement, Manufacturer: JUYAXIN