new High strength and hardness. Easy to use. Fits Dial indicator height gauge depth gauge etc interchangeable tool. Diameter: 5mm(0.1968 inch) Both end thread of extension rod: M2.5 Length: L20: . 20mm (0.7874 inch) L40: . 40mm (1.5748 inch) L60: . 60mm (2.3622 inch) L80: . 80mm (3.1496 inch) L100: . 100mm (3.937 inch) Colour: silver Material: metal Package Contents: 5 x Indicator Dial Rod Only the above package content, other products are not included. Note: Light reflection 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.