New and high quality. Made of high-quality material, practical to use. Indicator extension rod with M2.5 thread, available in 20mm, 40mm, 60mm, 80mm, and 100mm lengths. Compatible with interchangeable tools such as dial gauge altimeters, depth gauges, and similar devices. Effective length does not include the threaded portion. Diameter: 5mm (0.1968 inches). Extension rod has M2.5 threads on both ends. L25: 25mm (0.9842 inches) L50: 50mm (1.9685 inches) L75: 75mm (2.9527 inches) L100: 100mm (3.937 inches) Color: Silver Material: Stainless Steel Package Contents: 4 x Dial Digital Indicator Note: The package includes only the items listed above; other accessories are not included. Please note that lighting and monitor settings may cause slight variations in color between the image and the actual product. Measurement error allowance: ±1-3cm.