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 dimensions with consistent accuracy. Built for durability in workshop environments, the divider points are hardened to 50-55HRC for increased wear resistance, ensuring long-term reliability even with regular use. With a 150mm capacity, these spring callipers are suitable for a wide range of internal measurement tasks across engineering, fabrication and precision measurement applications. Features and Benefits: • High grade steel construction for durability • Spring joint mechanism for precision settings • Hardened divider points (50-55HRC) for wear resistance • Adjusting nut for controlled leg movement • 150mm capacity for versatile measurement tasks Contents: 1 x Inside Spring Calipers, 150mm