Description new and high quality. Made of high quality material, and practical to use. Indicator extension rod M2.5 thread 20mm 40mm 60mm 80mm 100mm length. Applicable to interchangeable tools such as dial gauge altimeter, depth gauge, etc. The effective length does not include the threaded rod. Diameter 5mm / 0.1968 inches(.) Extension Rod Thread At Both Ends: M2.5 L25:Length 25 mm / 0.9842 inches(.) L50: Length 50mm/ 1.9685 inch(.) L75: Length 75mm/ 2.9527 inches(.) L100: Length 100mm/ 3.937 inches(.) Colour: Silver Material: Stainless Steel Package Contents: 4 * Dial Digital Indicator Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.