Draper Inside Spring Callipers

The Draper Inside Spring Callipers are precision measuring tools designed for taking comparative internal measurements and transferring dimensions to micrometers, Vernier callipers or precision rules. Ideal for engineering, metalworking and quality control applications where accurate internal diameter measurements are required. Manufactured from high grade steel, these inside callipers feature a spring joint mechanism that enables precise settings and fine adjustments. The legs are opened and closed via an adjusting nut, allowing controlled measurement of internal dimension