The Sealey 300mm Spring Calipers Internal deliver maximum measuring capacity for larger bore diameters and internal dimensions. This 300mm size is specifically designed for applications requiring extended reach, making it invaluable for engineers and mechanics working with larger components, cylinders, and industrial equipment. These professional-grade calipers are designed for measuring distances between two points, such as bore diameters, with measurements easily transferred to a rule or micrometer for accurate reading. The adjusting washer and nut mechanism allows for fast and positive adjustment, ensuring you can work efficiently even when dealing with larger measurements. The brushed metal finish provides both durability and a professional appearance that stands up to the rigours of intensive workshop use. Ideal for automotive, engineering, and industrial applications where larger internal measurements are required, these calipers offer the precision and reliability demanded by pr