General description The Moore & Wright 3306R Firm Joint Inside Caliper is a precision measuring tool designed for accurate internal measurements. Made from polished tool steel, it features a large-headed nut and screw assembly that ensures a firm and rigid friction joint with no play. This caliper is suitable for professional and DIY use, providing reliable and consistent measurements. Technical specifications Size: 150mm (6 inches) Material: Polished tool steel Standards: Manufactured according to BS3123 standards Capacity: Generally 1/3 greater than the effective leg length Compatibility and accessories Compatible with other inside calipers and measuring tools that adhere to standard sizes and specifications No specific accessories included; compatible with standard calibration and measurement accessories Installation No installation required; ready to use out of the box Usage Use to measure internal dimensions with high precision Adjust the screw assembly to lock the caliper at the