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The Insize Measuring Tips for Screw Thread Micrometers (Code 7381) are precision-machined interchangeable anvils designed for measuring external screw threads. Supplied in pairs, these measuring tips are specifically engineered for compatibility with Insize 3281 and 3581 series screw thread micrometers. The series includes options for both Metric/Unified threads ($60^\circ$ thread angle) and Whitworth threads ($55^\circ$ thread angle), available in individual pitch ranges or complete sets.