The Moore & Wright 56R Spring Joint Jenny Caliper is manufactured from polished tool steel and the marking leg has been hardened to over 550Hv at the point. It is fitted with a bow spring that ensures uniform tension over the working range and a centrally mounted adjustment screw that offers finer setting than firm joint type. Also known as Hermaphrodite calipers. Size: 150mm (6in). Ref: UTTK3143