The Moore & Wright Spring Joint External Calipers have a bow spring that ensures uniform tension over the working range. They have a centrally mounted adjustment screw that offers a finer setting than firm joint type calipers. These spring joint external calipers conform to BS3123 standards. The Moore & Wright 524R Spring Joint External Calipers have the following specification: Size: 100mm (4in). https://elecena.pl/product/27211662/moore-amp-wright-524r-spring-joint-external-calipers-100mm-4in 2024-11-10 https://elecena.pl/product/27211662/moore-amp-wright-524r-spring-joint-external-calipers-100mm-4in 2025-01-05 https://elecena.pl/product/27211662/moore-amp-wright-524r-spring-joint-external-calipers-100mm-4in 2025-03-21 https://elecena.pl/product/27211662/moore-amp-wright-524r-spring-joint-external-calipers-100mm-4in 2025-09-15 https://elecena.pl/product/27211662/moore-amp-wright-524r-spring-joint-external-calipers-100mm-4in 2025-11-18