The Faithfull Internal Spring Caliper 1240285 is a precision hand tool engineered for measuring internal dimensions in metalworking, woodworking, and general workshop applications. Constructed from high-quality flat stock steel, these calipers feature a natural, polished finish that provides durability and clear visibility during detailed layout or inspection tasks. The design incorporates a robust yet flexible bow spring combined with a centrally positioned adjustment screw, allowing for smooth, incremental fine-tuning of the measurement setting. With carefully balanced legs and treated, hardened points, these calipers maintain stability and accuracy when transferring measurements from a workpiece to a ruler or gauge.