Brand new High strength and hardness. Easy to use. Suitable for interchangeable tool of height indicator height gauge, depth gauge, etc. Diameter: 5 mm (0.1968 inch) Both ends of extension rod thread: M2.5 Length: L20: approx. 20 mm (0.7874 inch) L40: approx. 40 mm (1.5748 inch) L60: approx. 60 mm (2.3622 inch) L80: approx. 80 mm (3.1496 inch) L100: approx. 100mm(3.937inch) Color: Silver Material: Metal Package Contents: 10 x Dial Indicator Stem Only the above package content, other products are not included. Note: Light shooting 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.