The Moore & Wright Spring Joint External Calipers have a bow spring to ensure uniform tension over the working range. They have a centrally mounted adjustment screw offering a finer setting than firm joint type calipers. These spring joint external calipers conform to BS3123 standards.Select Option 100mm (4in) (Retail Packaging)150mm (6in) (Retail Packaging)200mm (8in) (Retail Packaging)250mm (10in) (Retail Packaging)300mm (12in) (Retail Packaging) Add to Basket Quantity