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 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 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 Ideal for workshop toolkit , manufacturing floor inspections , and home garage projects where quick identification of screw thread and taps is critical for precise assembly, Manufacturer: TSMORY